உதவி:CS1 errors

வார்ப்புரு:pp-semi-indefவார்ப்புரு:Wikipedia how to This page describes the error messages reported by the வார்ப்புரு:cs1 and வார்ப்புரு:cs2 citations, what they mean, and how editors might resolve the errors. Category:CS1 errors is the general errors category and Category:CS1 maintenance is the general maintenance category.

Errors in the <ref> system can be found at Help:Cite errors.

Controlling error message display

By default, வார்ப்புரு:cs1 and வார்ப்புரு:cs2 error messages are visible to all readers and maintenance category messages are hidden from all readers.

To display maintenance messages, include the following text in your common CSS page or your specific skin's CSS page (common.css and skin.css respectively):

.mw-parser-output span.cs1-maint {display: inline;} /* display Citation Style 1 maintenance messages */

Even with this css installed, older pages in Wikipedia's cache may not have been updated to show these error messages even though the page is listed in one of the tracking categories. A null edit will resolve that issue.

To hide error messages:

.mw-parser-output span.cs1-visible-error {display: none;} /* hide Citation Style 1 error messages */

You can personalize the display of these messages (such as changing the color), but you will need to ask someone who knows CSS or at the technical village pump if you do not understand how.

Most common errors

• #Cite <template> requires |<param>=, ~52k pages
• #Citation without a title of any form, ~32k pages
• #Bare URL without a title, ~24k pages
• #Check date values in: |<param1>=, |<param2>=, ..., ~20k pages
• #External link in |<param>=, ~15k pages
• #Missing or empty |url=, ~10k pages

|access-date= requires |url=

The வார்ப்புரு:para (or its alias, வார்ப்புரு:para) is the date that the online resource addressed by வார்ப்புரு:para was added to the article. If வார்ப்புரு:para has been included in the citation without வார்ப்புரு:para then this message appears. If the citation does not use a web link, then வார்ப்புரு:para is redundant and should be removed.

When the online resource has a publication or other fixed date associated with it, வார்ப்புரு:para is of limited value though may be useful in identifying an appropriate archived version of the resource. Without வார்ப்புரு:para, வார்ப்புரு:para is not considered useful.

To resolve this error, provide a value for வார்ப்புரு:para or remove வார்ப்புரு:para. Editors should try to determine why the citation has வார்ப்புரு:para without வார்ப்புரு:para. For example, the citation may never have had a வார்ப்புரு:para, or வார்ப்புரு:para may have been removed because it links to a site that violates the creator's copyright (see WP:COPYLINK), or because வார்ப்புரு:para was deemed to be dead. If the citation never had வார்ப்புரு:para or it was removed for copyright violations, remove வார்ப்புரு:para. When a dead வார்ப்புரு:para has been removed, restore the வார்ப்புரு:para and if possible repair it (see WP:LINKROT).

Pages with this error are automatically placed in Category:Pages using citations with accessdate and no URL (0 pages).

|archive-url= is malformed

Archive.org allows a variety of urls to access snapshots of an archived page. Some of these are:

https://web.archive.org/web/YYYYMMDDhhmmss/http://www.example.com – a single snapshot; this is the preferred form for use with வார்ப்புரு:para

https://web.archive.org/web/*/http://www.example.com – a wildcard search results page; useful for locating an appropriate snapshot but not appropriate in a citation

https://web.archive.org/web/201603/http://www.example.com – incomplete timestamp; archive.org returns the most recent snapshot

https://web.archive.org/save/http://www.example.com – saves a new snapshot of the current target; do not use this form

There are two forms of the basic url:

https://web.archive.org/<timestamp>/... – the old form

https://web.archive.org/web/<timestamp><flags>/... – the new form

The error message identifies the reason for the message. The reasons are:

– the archive.org url is the save command

– web/ was expected but something else was found

– the timestamp portion of the url path is not 14 digits

– the flag portion of the url path (if present; new form urls only) is not 2 lowercase letters followed by an underscore: 'id_'

– liveweb.archive.org is a deprecated form of the domain name

When the archive.org url has any of these errors, Module:Citation/CS1 does not link to archive.org and emits an appropriate error message.

To resolve this error, choose the url of an appropriate snapshot from those held at archive.org. Search for the target url.

Pages with this error are automatically placed in Category:Pages with archiveurl citation errors.

|archive-url= requires |archive-date=

வார்ப்புரு:para (or its alias, வார்ப்புரு:para), identifies the date that the web resource was archived.

To resolve this error, provide a value for வார்ப்புரு:para. For web resources archived at archive.org, the archival date can be found in the வார்ப்புரு:para; for resources archived at webcitation.org, the cache date is included in the archive header.

Pages with this error are automatically placed in Category:Pages with archiveurl citation errors.

|archive-url= requires |url=

A properly formatted citation that includes வார்ப்புரு:para and வார்ப்புரு:para requires வார்ப்புரு:para. When the citation includes வார்ப்புரு:para, the ordering of elements in the rendered citation is changed to put the original url first.

To resolve this error, provide a value for வார்ப்புரு:para. For web resources archived at archive.org, the original url can be found in the வார்ப்புரு:para value; for resources archived at webcitation.org, the original url is included in the archive header.

Pages with this error are automatically placed in Category:Pages with archiveurl citation errors.

|arxiv= required

{{cite arXiv}} requires one, but not both, of the identifier parameters வார்ப்புரு:para or வார்ப்புரு:para.

To resolve this error, ensure that the template has வார்ப்புரு:para or வார்ப்புரு:para with a properly constructed value.

Pages with this error are automatically placed in Category:CS1 errors: arXiv.

|chapter= ignored

வார்ப்புரு:cs1 templates {{cite web}}, {{cite news}}, {{cite journal}}, {{cite press release}}, {{cite podcast}}, {{cite newsgroup}}, as well as template {{citation}} when it uses வார்ப்புரு:para or any of its aliases, do not support வார்ப்புரு:para or the aliases வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, or வார்ப்புரு:para.

To resolve this error:

• use a more appropriate citation template, or
• place the content of the வார்ப்புரு:para parameter in வார்ப்புரு:para, or
• for {{cite news}}, வார்ப்புரு:para can be used to give the name of the newspaper's section, such as "Obituaries"

Pages with this error are automatically placed in Category:CS1 errors: chapter ignored.

Check |arxiv= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the arXiv identifier conforms with the arXiv identifier scheme. The identifier is checked for a valid number of digits in the article id; valid year and month values; and properly-placed hyphens, slashes, and dots.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: arXiv.

Check |asin= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the ASIN identifier is contains ten upper-case alphanumeric characters without punctuation or spaces and that if the first character is numeric, that the ASIN conforms to the rules for a ten-digit ISBN.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

If the வார்ப்புரு:para value is correct and all-numeric, use வார்ப்புரு:para instead and delete any வார்ப்புரு:para parameters. Articles with CS1 citations that use வார்ப்புரு:para with all numeric values are categorized in Cat:CS1 maint: ASIN uses ISBN.

Pages with this error are automatically placed in Category:CS1 errors: ASIN.

Check |bibcode= <message>

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the bibcode identifier has the proper format. Bibcodes are expected to match these requirements:

length must be 19 characters (<message> = '')

characters in position(s): (except as specified otherwise, violations produce '' in the <message> portion of the error message):

1–4 must be digits and must represent a year in the range of 1000 – next year (<message> = '')

5 must be a letter

6–8 must be letter, ampersand, or dot (ampersand cannot directly precede a dot; &. (<message> = ''))

9 must be letter or dot

10–18 must be letter, digit, or dot

19 must be a letter or dot

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: bibcode.

Check |biorxiv= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the bioRxiv identifier comprises six numeric characters without punctuation or spaces. A common error is to include the bioRxiv url (https://dx.doi.org/10.1101/<BIORXIV>), or the biorxiv doi (10.1101/<BIORXIV>)

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: bioRxiv.

Check |citeseerx= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the CiteSeerX identifier has the proper format. The expected identifier is the value assigned to the ?doi= query key in the URL of a CiteSeerX document. (This query key should not be confused with a Digital Object Identifier: it should not be input as வார்ப்புரு:para.)

For instance, if you want to link to http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.220.7880, use வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: citeseerx.

Check date values in: |<param1>=, |<param2>=, ...

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain date-holding parameters, an automated test is done to see if the dates are real dates that comply with a subset of the date rules in Wikipedia's Manual of Style, specifically checking for violations of MOS:DATEFORMAT.

To resolve this error, ensure that the date is an actual date and that the date format follows the in the named parameter. See examples of unacceptable dates and how to fix them, below. Or, some conceptual issues to look for:

• impossible dates, such as 29 February 2011 (2011 was not a leap year)
• வார்ப்புரு:para must specify a day, not just a month or year.
• misplaced, incorrect, or extraneous punctuation
• extraneous text
• hyphens or slashes instead of en dashes in date ranges (en dashes are required)
• misspelling or improper capitalization (see for more detail that is not in )
• other unacceptable date formats listed in
• more than one date in a date-holding parameter
• years before 100 AD, including BCE/BC dates. Try using parameter வார்ப்புரு:para instead.

See Help: Citation Style 1 for information about limitations in the CS1 citation templates' handling of date formats. The MOS section on date ranges describes how to separate dates in a date range. Do not use  , –, or {{spaced ndash}} as these corrupt the metadata. To add an en dash, use the CharInsert edit tool or see Wikipedia:How to make dashes. You may also use this one: –. A bot is often able to correct the separator, provided the overall format is unambiguous.

Future dates in வார்ப்புரு:para in CS1|2 citations are limited to current year + 1; that is, for 2024, citation dates in 2025 are acceptable but citation dates in 2026 and beyond are not.

Dates prior to 1582 are treated as Julian calendar dates. Dates from 1582 onward are treated as Gregorian calendar dates. The Julian calendar was used in some places until approximately 1923. Three Julian calendar dates in the overlap period, 29 February in the years 1700, 1800, and 1900, will cause this error message because those years are not leap years in the Gregorian calendar.

The access date (in வார்ப்புரு:para) is checked to ensure that it contains a full date (day, month, and year) and is between 15 January 2001 (the founding date of Wikipedia) and today's date plus one day, because it represents the date that an editor viewed a web-based source to verify a statement on Wikipedia. Because editors may be in time zones that are one day ahead of the UTC date, one extra day is accepted.

Pages with this error are automatically placed in Category:CS1 errors: dates (0 pages). வார்ப்புரு:anchor வார்ப்புரு:anchor

Examples of unacceptable dates and how to fix them

Issue	Unacceptable	Acceptable
Hyphen in date range (use en dash)	வார்ப்புரு:para	வார்ப்புரு:para
Slash in date range (use en dash)	வார்ப்புரு:para or வார்ப்புரு:para	வார்ப்புரு:para or வார்ப்புரு:para
Hyphen in date range (use en dash)	வார்ப்புரு:para	வார்ப்புரு:para
Missing space around en dash for range of full dates	வார்ப்புரு:para	வார்ப்புரு:para
Month capitalization	வார்ப்புரு:para	வார்ப்புரு:para
Month capitalization	வார்ப்புரு:para	வார்ப்புரு:para
Season capitalization	வார்ப்புரு:para	வார்ப்புரு:para
Future date (typo)	வார்ப்புரு:para	வார்ப்புரு:para
Access date in future (see note above)	வார்ப்புரு:para	வார்ப்புரு:para
Access date impossibly far in the past (typo)	வார்ப்புரு:para	வார்ப்புரு:para
Access date only specifies month	வார்ப்புரு:para	வார்ப்புரு:para
Ambiguous date range or year and month	வார்ப்புரு:para	வார்ப்புரு:plainlist
Bad abbreviation	வார்ப்புரு:para	வார்ப்புரு:plainlist
Nonexistent date	வார்ப்புரு:para
Undated	வார்ப்புரு:para	வார்ப்புரு:para
Comma in month and year	வார்ப்புரு:para	வார்ப்புரு:para
Comma in season	வார்ப்புரு:para	வார்ப்புரு:para
Missing comma in format which requires it	வார்ப்புரு:para	வார்ப்புரு:para or வார்ப்புரு:para
Non-date text	வார்ப்புரு:para	வார்ப்புரு:para வார்ப்புரு:green
Zero-padding	வார்ப்புரு:para	வார்ப்புரு:para
Date with slashes	வார்ப்புரு:para	வார்ப்புரு:plainlist
Two-digit year	வார்ப்புரு:para	வார்ப்புரு:para
One-digit month or day	வார்ப்புரு:para	வார்ப்புரு:para
Wikified date	வார்ப்புரு:para	வார்ப்புரு:para
"mm-dd-yyyy" or "dd-mm-yyyy" date format	வார்ப்புரு:para	வார்ப்புரு:para or வார்ப்புரு:para or வார்ப்புரு:para or வார்ப்புரு:para
Approximate or uncertain dates	வார்ப்புரு:para or வார்ப்புரு:para	வார்ப்புரு:para

Check |doi= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the prefix portion of the DOI value is correctly formatted and has what appears to be a valid registrant code. A proper doi prefix begins with the 10. directory indicator. The remaining portion of the prefix is a string of digits and the dot character which form the registrant code. When the directory indicator is 10., the cs1|2 templates test for a valid registrant code. Valid registrant codes:

• must be composed of digits
• must be in the range:
  • 1000–9999
  • 10000–39999
• may have one or more subcodes that begin with a dot followed by digits (1000.10)
• must not be 5555 (invalid/temporary/test)

Additionally, the வார்ப்புரு:para value is checked to make sure that it does not contain spaces, en dashes, does not end with punctuation. Further validation of the DOI is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: DOI.

Check |hdl= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the hdl value looks like a properly defined value. The வார்ப்புரு:para value is checked to make sure that it does not contain spaces or en dashes and does not end with punctuation. Further validation of the hdl is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: HDL.

Check |isbn= value

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates that contain வார்ப்புரு:para are checked to ensure that the ISBN is the proper length (ten or thirteen digits), that the ISBN uses the correct optional separators (simple space or hyphen), and that the final check digit is correct according to the ISBN specification. Only one ISBN is allowed in this field because the whole வார்ப்புரு:para value is included in the citation's COinS metadata. See also Wikipedia:COinS. More than one ISBN, or characters that are not part of the ISBN, corrupt the COinS metadata and may also corrupt the link to Special:BookSources.

The error message <type> indicator can be:

– ISBN is not 10 or 13 digits

– ISBN has one or more incorrect digits; look for typos and transposition

– ISBN has one or more 'digits' that is not in the allowed set appropriate to ISBN length

– 13-digit ISBNs must begin with '978' or '979'

– 10-digit ISBNs with the mis-positioned 'X' character

To resolve this error, ensure that the வார்ப்புரு:para value is correct, that only one ISBN is used, that the proper optional separators are used, and that no other text is included. Use the 13-digit ISBN when it is available. When a 10-digit ISBN is used, if the check digit is a lowercase 'x', change it to an uppercase 'X'.

• Do not try to resolve the error by simply recalculating the check digit. The check digit is there to check whether the main part of the number is correct. If the ISBN is failing to validate, it is likely that there is a typo in the main part of the number. In this case, recalculating the check digit results in an apparently valid ISBN that leads to the wrong source (or to nowhere).
• If you only have a 10-digit ISBN, do use the number as-is, do not try to convert it to the 13-digit form.
• If the ISBN as printed in your source is refusing to validate, do check both the front matter and the book cover for ISBNs. It is not uncommon for the ISBN to be misprinted in the front matter but correct on the cover.
• Do preview your edit and check that the new ISBN does now link to the correct source.

In very rare cases, publishers have released books with malformed ISBNs. If you are certain that a non-conforming ISBN truly corresponds to the published work, then you can add வார்ப்புரு:para to the citation in order to suppress the error message. In many cases, books may have been reissued with a corrected ISBN. Use a corrected ISBN when possible.

Sometimes there are numbers assigned to வார்ப்புரு:para that appear to be legitimate – length is right, check digit is correct – but that aren't true ISBN numbers. This tool may be helpful.

See also Wikipedia:ISBN.

Pages with this error are automatically placed in Category:CS1 errors: ISBN.

Check |ismn= value

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates that contain வார்ப்புரு:para are checked to ensure that the ISMN is the proper length (thirteen digits), that the ISMN uses the correct optional separators (simple space or hyphen), and that the final check digit is correct according to the ISMN specification. Only one ISMN is allowed in this field because the whole வார்ப்புரு:para value is included in the citation's COinS metadata. See also Wikipedia:COinS. More than one ISMN, or characters that are not part of the ISMN, corrupt the COinS metadata.

To resolve this error, ensure that the வார்ப்புரு:para value is correct, that only one ISMN is used, that the proper optional separators are used, and that no other text is included. Make sure that the ISMN contains exactly 13 digits.

Pages with this error are automatically placed in Category:CS1 errors: ISMN.

Check |issn= value

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates that contain வார்ப்புரு:para and/or வார்ப்புரு:para are checked to ensure that the ISSN is the proper length (eight digits) and that the final check digit validates according to the ISSN specification. Only one each of ISSN and eISSN is allowed in this field because the whole வார்ப்புரு:para and வார்ப்புரு:para values are included in the citation's COinS metadata. See also Wikipedia:COinS. The ISSN and eISSN are always rendered as two four-digit numbers separated with a hyphen.

To resolve this error, ensure that the வார்ப்புரு:para and வார்ப்புரு:para values are correct, that only one value per parameter is used, and that no other text is included (allowable characters are 0-9, X, and -). If the check-digit is a lowercase 'x', change it to an uppercase 'X'.

Pages with this error are automatically placed in Category:CS1 errors: ISSN.

Check |jfm= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the jfm identifier value looks like a properly defined value. The வார்ப்புரு:para identifier is checked to make sure that it has the form: nn.nnnn.nn where n is any digit 0–9. Further validation of the jfm identifier is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: JFM.

Check |lccn= value

The வார்ப்புரு:para parameter is the Library of Congress Control Number identifier. It is checked to ensure that the identifier is the proper length and has the correct initial digits.

LCCN is a character string 8–12 characters long. The length of the LCCN dictates the character type of the initial 1–3 characters; the rightmost eight are always digits.

LCCN format description

Length	Description
8	all characters are digits
9	first character is a lower case letter
10	first two characters are either both lower case letters or both digits
11	first character is a lower case letter, second and third characters are either both lower case letters or both digits
12	first two characters are both lower case letters

Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct and that there are no other letters, punctuation, or other characters.

When receiving this error, be on the lookout for publishers who omitted leading zeros in the LCCN following the two or four digit year. For example, an LCCN that is properly 92-035427 could be shortened in the printed work to 92-35247. When experimenting with inserting omitted zeroes, cross-check the finished number against the LCCN permalinks online.

Pages with this error are automatically placed in Category:CS1 errors: LCCN.

Check |message-id= value

The வார்ப்புரு:para parameter holds the unique identifier associated with a netnews message. The value in வார்ப்புரு:para is checked to make sure that it contains @ between left and right identifiers. வார்ப்புரு:para is also checked to make sure that the first character is not < and the last character is not >. Module:Citation/CS1 adds the uri news: to the value in வார்ப்புரு:para. If the value in வார்ப்புரு:para is wrapped in <...> characters, the link created fails.

Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct, that it contains @ and is not wrapped in <...> characters.

Pages with this error are automatically placed in Category:CS1 errors: message-id.

Check |mr= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the mr identifier value looks like a properly defined value. The வார்ப்புரு:para identifier is checked to make sure that it contains only digits and that it is no more than seven digits in length. Further validation of the mr identifier is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: MR.

Check |oclc= value

The வார்ப்புரு:para parameter is the OCLC identifier. Only a single OCLC identifier is allowed. The identifier must be in one of these forms:

1. prefix ocm followed by 8 digits
2. prefix ocn followed by 9 digits
3. prefix on followed by 10 digits
4. prefix (OCoLC) followed by a variable number of digits without leading zeros
5. 1 to 10 digits without prefix

Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

A tip for fixing this error: Editors sometimes place valid ISBN, LCCN, ASIN, or other identifiers in வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: OCLC.

Check |ol= value

The வார்ப்புரு:para parameter is the Open Library identifier. The identifier is one or more digits followed by a last character that is either A (authors), M (books), or W (works). Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct. Do not include "OL" in the value.

Pages with this error are automatically placed in Category:CS1 errors: OL.

Check |<param>-link= value

These link-holding parameters and their matching title-holding parameters are combined to create a working wikilink to a related article. வார்ப்புரு:div col

• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para

(Parameters checked for this error may also be of the form வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, or வார்ப்புரு:para.)

This error occurs when any of these வார்ப்புரு:para parameters contain a wikilink or a URL, or they contain any of the characters not permitted in Wikipedia article titles per WP:TITLESPECIALCHARACTERS (except _ (underscore), used as a replacement for spaces, and #, used as a fragment identifier when linking to article sections). The prohibited characters are: < > [ ] | { }.

The வார்ப்புரு:para parameter value should contain only the title of a Wikipedia article or a link to a section of a Wikipedia article. Module:Citation/CS1 checks the வார்ப்புரு:para parameter values for wikimarkup and for a URI scheme (http://, https://, the protocol relative scheme //, etc.).

This error can also be caused when there is a வார்ப்புரு:para value and the matching வார்ப்புரு:para parameter contains a wikilink.

To resolve this error, do one of the following:

• Ensure that the வார்ப்புரு:para value is the full name of a Wikipedia article (without brackets) or a section of an article, and not a link to an external web site.
• Make sure that there are no wikilinks in the matching வார்ப்புரு:para parameters.
• If you want to link to a URL outside of Wikipedia, move the link to வார்ப்புரு:para or a similar parameter, if one is available in the template you are using.

Pages with this error are automatically placed in Category:CS1 errors: parameter link.

Check |pmc= value

The வார்ப்புரு:para parameter is the PubMed Central identifier. PMCs are sequential numbers beginning at 1 and counting up. Module:Citation/CS1 checks the PMC identifier to make sure that the value is a number greater than zero and less than 6000000 and that the identifier contains only digits. Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct, and that there are no letters, punctuation, or other characters. Do not include "PMC" in the value.

Pages with this error are automatically placed in Category:CS1 errors: PMC.

Check |pmid= value

The வார்ப்புரு:para parameter is the PubMed identifier. PMIDs are checked to ensure that the identifier is a simple number without punctuation or spaces with a value greater than or equal to 1 and less than or equal to 33000000. Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct. If you find something that looks like a PMID and begins with "PMC", use வார்ப்புரு:para instead of வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: PMID.

Check |ssrn= value

The வார்ப்புரு:para parameter is the Social Science Research Network identifier. SSRNs are checked to ensure that the identifier is a simple number without punctuation or spaces with a value greater than or equal to 100 and less than or equal to 3500000. Further validation is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: SSRN.

Check |url= value

External links in வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates are made from two parts: the title (வார்ப்புரு:para, வார்ப்புரு:para, etc.) and the URL (வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, etc.). The வார்ப்புரு:para parameter and other URL parameters must begin with a supported URI scheme. The URI schemes http://, https:// and the protocol relative scheme // are most commonly used; irc://, ircs://, ftp://, news:, mailto: and gopher:// are also supported.

The URL field is checked to ensure that it contains only Latin characters and does not contain spaces. The URL may be protocol relative (begins with //). If there are no spaces and the URL is not protocol relative, then the scheme must comply with RFC 3986.

Top- and second-level domain names are checked for proper form. Generally, top-level domain names must be two or more letters; second-level domain names must be two or more letters, digits, or hyphens (first and last character must be a letter or digit). Single-letter second-level domains are supported for:

all cc TLDs (the country code is not validated)

the .org TLD

certain letters of the .com TLD (q, x, z)

certain letters of the .net TLD (i, q)

Third- and subsequent-level domain names are not checked. The path portion of the URL is not checked.

To resolve this error, ensure that வார்ப்புரு:para and other URL parameters contain valid URLs. Online tools are available to internationalize URLs that are written in non-Latin scripts:

வார்ப்புரு:cite web

வார்ப்புரு:cite web

Pages with this error are automatically placed in Category:Pages with URL errors.

Check |zbl= value

When வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates contain வார்ப்புரு:para, a test is done to see if the zbl identifier value looks like a properly defined value. The வார்ப்புரு:para identifier is checked to make sure that it has the form: nnnn.nnnnn where n is any digit 0–9. Up to three leading zeros in the first quartet may be omitted. Further validation of the zbl identifier is not performed.

To resolve this error, ensure that the வார்ப்புரு:para value is correct.

Pages with this error are automatically placed in Category:CS1 errors: ZBL.

|biorxiv= required

{{cite bioRxiv}} requires the identifier parameter வார்ப்புரு:para.

To resolve this error, ensure that the template has வார்ப்புரு:para with a properly constructed value.

Pages with this error are automatically placed in Category:CS1 errors: bioRxiv.

Cite <template> requires |<param>=

These CS1 periodical templates require a periodical parameter. The periodical templates are:

{{cite journal}}

{{cite magazine}}

The error message suggests a periodical parameter that matches the template, but there is no requirement to use the suggested parameter; any one of these periodical parameters may be used:

• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para

Pages with this error are automatically placed in Category:CS1 errors: missing periodical (0 pages).

Cite uses deprecated parameter |<param>

Over time, some parameters have become obsolete or unnecessary. When this happens, the parameters are identified as deprecated. Editors are encouraged to use other parameters that accomplish the same purpose as those that have been deprecated. The CS1|2 deprecated parameters are listed in the following table, along with recommended replacement parameters. Parameter names are case-sensitive. Editors should expect that support for deprecated parameters will be withdrawn.

Deprecated CS1/CS2 parameters

Deprecated parameter	Replace with
none deprecated at present

To resolve this error, use a supported parameter.

Pages with this error are automatically placed in Category:CS1 errors: deprecated parameters.

|citeseerx= required

{{cite citeseerx}} requires the identifier parameter வார்ப்புரு:para.

To resolve this error, ensure that the template has வார்ப்புரு:para with a properly constructed value.

Pages with this error are automatically placed in Category:CS1 errors: citeseerx.

|class= ignored

Only used in {{cite arXiv}} templates, வார்ப்புரு:para is only appropriate when the template uses வார்ப்புரு:para or வார்ப்புரு:para identifier formats; see Cite arXiv §Usage.

To resolve this error, remove வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: class.

|contributor= ignored

Only used in book citations, வார்ப்புரு:para identifies the author of a contribution, typically an afterword, foreword, introduction, preface, etc., to another (primary) author's work. This error occurs when வார்ப்புரு:para is used in a template that is not {{cite book}} or {{citation}} or is one of these two templates and one of the வார்ப்புரு:para parameter aliases is set.

To resolve this error, choose a more appropriate CS1 or CS2 template or remove வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: contributor.

|contributor= requires |<param>=

Only used in book citations, வார்ப்புரு:para identifies the author of a contribution, typically an afterword, foreword, introduction, preface, etc., to another (primary) author's work. As such, the primary author is required (வார்ப்புரு:para or appropriate alias) as is the title of the contribution (வார்ப்புரு:para).

To resolve this error, include the book's primary author in வார்ப்புரு:para, or வார்ப்புரு:para, வார்ப்புரு:para, or வார்ப்புரு:para and include the contribution title in வார்ப்புரு:para; or remove வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: contributor.

Empty citation

A வார்ப்புரு:cs1 or வார்ப்புரு:cs2 template marked as "Empty" contains no recognizable parameter identifiers. For example, this citation is marked as "empty" even though it contains usable information:

{{cite web | http://www.foobar.com | The Foobar News}}

The citation is "empty" because it does not contain the necessary parameter identifiers (in this case வார்ப்புரு:para and வார்ப்புரு:para) that tell {{cite web}} how to use the information that the citation does contain.

A citation is also marked as "empty" when it contains only parameters that it doesn't recognize:

{{cite book |titolo=The Bazquux Uprising |anno=2015}}

This citation is "empty" because the Italian-language parameters வார்ப்புரு:para and வார்ப்புரு:para are not recognized as valid parameter names on the English Wikipedia.

"Empty citation" may also mean that an editor meant to use another template entirely. Perhaps the editor used {{citation}} when the intent was to use {{citation needed}} or {{quote}}.

To resolve this error, add appropriate parameter identifiers, translate foreign language parameter names to their English equivalents, or replace the CS1/CS2 template with a more appropriate template.

Pages with this error are automatically placed in Category:Pages with empty citations.

Explicit use of et al.

This error occurs where a வார்ப்புரு:cs1 or வார்ப்புரு:cs2 template detects that one of the names parameters contains some form of "et al." either as a separate name parameter (வார்ப்புரு:para) or as a suffix added to a name list (வார்ப்புரு:para) or first name (வார்ப்புரு:para).

This error can occur in any of the author, editor, interviewer, translator, or contributor parameters.

Use the வார்ப்புரு:para parameter instead (or other applicable display-X parameter), as documented at Help:Citation Style 1#Display options.

Pages with this error are automatically placed in Category:CS1 errors: explicit use of et al.

External link in |<param>=

This error occurs when any of the CS1 or CS2 citation title-holding parameters – வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para or any of its aliases: வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para and வார்ப்புரு:para – hold an external link (URL). External links in these parameters corrupt the citation's metadata and can be the source of a variety of other error messages.

To resolve this error, remove the external link from the identified parameter. Consider placing the external link in a more appropriate parameter:

• for வார்ப்புரு:para, the URL may belong in வார்ப்புரு:para.
• for other parameters, it may belong in வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: external links (0 pages).

|<first>n= missing |<last>n=

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates requires a வார்ப்புரு:para parameter for each வார்ப்புரு:para parameter in a citation. Author, contributor, editor, interviewer, and translator lists are checked for proper last/first pairing. CS1|2 will emit this error message for the first mismatch it detects. If there are more last/first mismatches in a citation, subsequent mismatches are not detected.

There is no requirement that each வார்ப்புரு:para have a matching வார்ப்புரு:para.

To resolve this error, ensure that each வார்ப்புரு:para has a corresponding வார்ப்புரு:para.

Pages with this error are automatically placed in Category:CS1 errors: missing name.

|format= requires |url=

These errors occur when வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates use வார்ப்புரு:para or வார்ப்புரு:para without also providing a corresponding URL for வார்ப்புரு:para or வார்ப்புரு:para, respectively. The வார்ப்புரு:para and வார்ப்புரு:para parameters are used to specify the file format of a web resource, such as PDF, DOC, or XLS. In some cases an editor may have intended to use வார்ப்புரு:para to specify a kind of document, such as hard cover, paperback, or pamphlet. The வார்ப்புரு:para and வார்ப்புரு:para value is always displayed.

The list of வார்ப்புரு:para parameters is:

வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para

As of 29 November 2014, வார்ப்புரு:para is a new parameter. Citations that relied on the old, somewhat odd use of வார்ப்புரு:para and வார்ப்புரு:para may need adjustment.

To resolve this error, remove வார்ப்புரு:para or வார்ப்புரு:para; define வார்ப்புரு:para or வார்ப்புரு:para; or change வார்ப்புரு:para to வார்ப்புரு:para (or to வார்ப்புரு:para if வார்ப்புரு:para is used without வார்ப்புரு:para.

Pages with this error are automatically placed in Category:Pages using citations with format and no URL.

Invalid |script-<param>=: <type>

The various வார்ப்புரு:para parameters are checked for proper form. When an error is detected, the error message briefly identifies the type of the error:

– the வார்ப்புரு:para parameter has a language-code prefix but is otherwise empty

– the வார்ப்புரு:para parameter has text but is missing the required language-code prefix; the prefix has the form xx: where xx is a valid ISO 639-1 language code known to cs1|2 as a language that uses a non-Latin script; the colon (:) is required

– the வார்ப்புரு:para parameter has a (possibly valid) ISO 639-1 language code that cs1|2 does not recognize as a language using a non-Latin script

Known codes are:

Pages with this error are automatically placed in Category:CS1 errors: script parameters.

Invalid <param>=<value>

To function properly, some parameters are limited to a certain set of acceptable values. This error message indicates that a parameter has been assigned a value that is not a member of the parameter's defined set of acceptable values.

Letters in values must all be in lower case, as shown below.

Parameters with limited acceptable values

parameter	acceptable values
வார்ப்புரு:para	dmy, dmy-all, mdy, mdy-all, ymd, ymd-all
வார்ப்புரு:para	true, y, yes
வார்ப்புரு:para
வார்ப்புரு:para	cs1, cs2
வார்ப்புரு:para	vanc
வார்ப்புரு:para	true, y, yes
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para	subscription, registration, limited
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para	free
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para
வார்ப்புரு:para	dead, live, unfit, usurped

To resolve this error, use an appropriate value.

Pages with this error are automatically placed in Category:CS1 errors: invalid parameter value.

Italic or bold markup not allowed in: |<param>=

வார்ப்புரு:help desk Italic ('') or bold (''') wikimarkup is not allowed in publisher and periodical parameters. These parameters include:

• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para
• வார்ப்புரு:para

To resolve this error, remove wiki markup from the named parameter's value and ensure that the template is using the correct parameters; when citing a newspaper, use வார்ப்புரு:para for the newspaper's name, not வார்ப்புரு:para, etc.

Pages with this error are automatically placed in Category:CS1 errors: markup.

Missing |<name>n=

So that all names are listed in a rendered citation, வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates require n in வார்ப்புரு:para (and its aliases) to increment by 1 for each name in the list (author, contributor, editor, interviewer, translator). This error message is emitted when there is a 'hole' in the numbering (an author list made up of வார்ப்புரு:para and வார்ப்புரு:para but without வார்ப்புரு:para for example).

The test will not detect a 'hole' that is larger than 1. It is presumed that when வார்ப்புரு:para and வார்ப்புரு:para are both not present, then the test has reached the end of the list.

To resolve this error, ensure that the numbering of the வார்ப்புரு:para parameters increments properly.

Pages with this error are automatically placed in Category:CS1 errors: missing name.

Missing pipe

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates report this error when one parameter has text that looks like it is a parameter missing a pipe (|). This error occurs when a template parameter value contains characters and digits followed by an equal sign. If the alphanumeric text immediately preceding the equal sign is a valid cs1|2 parameter name, the module assumes that the template is missing a pipe and emits this error message.

Some legitimate titles will contain a cs1|2 parameter name followed by an equal sign. In that case, enclose the equal sign in nowiki tags, like this: வார்ப்புரு:tag. For most other cases, simply add the missing pipe.

Pages with this error are automatically placed in Category:CS1 errors: missing pipe.

Missing or empty |title=

There are two slightly different error conditions that can arise when CS1 citations lack appropriate titles. In each case, CS1 reports this error message. The necessary resolution may vary depending on the cause of the error. The error message links to the appropriate description below.

Bare URL without a title

All வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates report this error when one of the URL-containing parameters cannot be paired with an associated title. This error may also occur when வார்ப்புரு:para cannot be linked with வார்ப்புரு:para because the citation also contains a conflicting வார்ப்புரு:para parameter.

URL-containing parameters and associated title parameters

URL parameters	Title parameters
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para

A unique case exists: if வார்ப்புரு:para has a value and வார்ப்புரு:para is omitted or empty, then வார்ப்புரு:para is linked with the same URL as the PMC.

Because URLs are ugly and generally uninformative, it is expected that editors should provide a meaningful title for each URL. In most cases this can be accomplished by using the வார்ப்புரு:para parameter.

To resolve this error, provide an appropriate title for the URL-containing parameter. In the case where வார்ப்புரு:para and வார்ப்புரு:para are contending for வார்ப்புரு:para you must choose which one to keep. Consider moving வார்ப்புரு:para or வார்ப்புரு:para to a more suitable parameter.

Pages with this error are automatically placed in Category:Pages with citations having bare URLs (0 pages).

Citation without a title of any form

This error occurs for வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates when all of வார்ப்புரு:para, வார்ப்புரு:para, and வார்ப்புரு:para are omitted or left blank. At least one of these title parameters must be provided for each citation.

{{cite episode}} will show this error if வார்ப்புரு:para is omitted or left blank (even if a வார்ப்புரு:para is provided).

Sometimes this error occurs because an editor has used a CS1|2 citation as a shortened footnote when {{sfn}} or one of the {{harv}} family of templates would have been more appropriate. This error also occurs when an editor used {{citation}} but intended to use {{citation needed}}.

To resolve this error, provide a value for வார்ப்புரு:para, வார்ப்புரு:para, and/or வார்ப்புரு:para or replace the CS1|2 template with a more appropriate template. If you are listing a periodical or an issue of a periodical in a bibliography rather than within வார்ப்புரு:tag tags, {{List journal}} may be more appropriate.

Pages with this error are automatically placed in Category:Pages with citations lacking titles (0 pages).

Missing or empty |url=

This error message is reported by {{cite web}}, {{cite podcast}}, and {{cite mailing list}} when the template parameters வார்ப்புரு:para and வார்ப்புரு:para are both missing, blank or not properly entered. Note that வார்ப்புரு:para or வார்ப்புரு:para is the name of the site, not the URL.

To resolve this error, provide a value for வார்ப்புரு:para or use a more appropriate template such as {{cite book}}, {{cite journal}} or other வார்ப்புரு:cs1 or வார்ப்புரு:cs2 template.

Pages with this error are automatically placed in Category:Pages using web citations with no URL (0 pages).

More than one of |<param1>=, |<param2>=, and |<param3>= specified

This error occurs when a வார்ப்புரு:cs1 or வார்ப்புரு:cs2 template includes more than one parameter that maps to the same meaning. For example, வார்ப்புரு:para, வார்ப்புரு:para, and வார்ப்புரு:para are all synonyms of each other, so no more than one of these parameters should ever be used in a single template.

To resolve this error, remove or modify the redundant parameter(s).

This error occurs when a CS1 or CS2 template uses more than one type of author or editor name-list style. There are three kinds of incompatible author-name-list styles:

வார்ப்புரு:para and வார்ப்புரு:para / வார்ப்புரு:para (and their various aliases), வார்ப்புரு:para, and வார்ப்புரு:para

and similarly, three editor-name-list styles:

வார்ப்புரு:para and வார்ப்புரு:para / வார்ப்புரு:para (and their various aliases), வார்ப்புரு:para, and வார்ப்புரு:para

To resolve this error, choose one name-list-style. Use the chosen style for both of the author and editor name-lists.

Pages with these errors are automatically placed in Category:Pages with citations having redundant parameters.

|ssrn= required

{{cite ssrn}} requires the identifier parameter வார்ப்புரு:para.

To resolve this error, ensure that the template has வார்ப்புரு:para with a properly constructed value.

Pages with this error are automatically placed in Category:CS1 errors: SSRN.

Text "????" ignored

Unlike many Wikipedia templates, the வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates do not use unnamed or positional parameters. When a citation contains text between vertical bars and that text does not contain an equal sign (=), CS1|2 ignores the text and reports the error. This is true even when the text is the name of a valid parameter.

This error can also be caused by vertical bars (pipe characters) that are part of URLs or titles. When vertical bars occur in URLs, replace each vertical bar with %7c. When vertical bars occur in parameter values that are not URLs, replace each vertical bar with | or {{!}}.

To resolve this error, remove the extraneous text, add '=', add an appropriate parameter name from the template you're using to complete the parameter, or properly encode vertical bars in URLs and titles.

Pages with this error are automatically placed in Category:Pages with citations using unnamed parameters.

|trans-<param>= requires |<param>=

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates report this error when the citation has an English translation of the title in வார்ப்புரு:para or chapter title in வார்ப்புரு:para but does not have the original-language title in வார்ப்புரு:para or original-language chapter title in வார்ப்புரு:para.

To resolve this error, provide the original language title for வார்ப்புரு:para or chapter title for வார்ப்புரு:para. Consider adding வார்ப்புரு:para if not already part of the citation.

Pages with this error are automatically placed in Category:CS1 errors: translated title.

Unknown parameter |xxxx= ignored

வார்ப்புரு:cs1 and வார்ப்புரு:cs2 templates report this error when the name portion of a parameter's வார்ப்புரு:para pair is not recognized as a valid name. Typically, this is caused by spelling or capitalization errors or when a page is reverted to a version where the citation template did support the parameter.

The CS1|2 engine does not ignore unrecognized parameters. The purpose of the citation is to properly identify the source; not act as a repository of notes and ancillary information.

CS1|2 template parameters are lower case. CS1|2 will report this error when the parameter's name contains uppercase letters (Xxxx, xxXx, XXXX) but the parameter's name is defined as lowercase (வார்ப்புரு:xt). The identifier parameters, like வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para, etc., can be either lower case or upper case, but not of mixed case (வார்ப்புரு:xt or வார்ப்புரு:xt but not வார்ப்புரு:para). For common parameter misspellings, like வார்ப்புரு:para instead of வார்ப்புரு:para, CS1|2 will suggest a valid parameter name.

To resolve this error, replace the erroneous parameter name with a correct one, possibly using the suggested name. Ensure that the parameter's name is correctly spelled and that there are no characters except spaces between the parameter's name and the leading vertical bar (|) or trailing equals sign (=). A list of valid parameters can be found by consulting Help:Citation Style 1 or visiting the description page of the specific template being used, such as {{cite web}}, {{cite book}}, {{cite journal}}, etc. Consider moving information associated with the unknown parameter into an appropriate parameter or to a section of the article's talk page for preservation.

Pages with this error are automatically placed in Category:Pages with citations using unsupported parameters.

URL–wikilink conflict

External links in a rendered citation are a combination of url-holding parameters, வார்ப்புரு:para, வார்ப்புரு:para, etc., with title-holding parameters, வார்ப்புரு:para, வார்ப்புரு:para, etc. Title-holding parameters may be wikilinked to another Wikipedia article but not when there is a matching url-holding parameter in the citation. When this condition occurs, the wikilink is suppressed, the wiki markup ignored, and the rendered citation links to the external site.

Some templates will also cause this error if they are part of a title-holding parameter. The error occurs when the template produces wikilinked content. For example, {{lang}} templates output a wikilinked category. Templates in url-holding parameters may also corrupt the citation's COinS metadata. As a general rule, avoid using templates in title-holding parameters unless you know that the template's effects are entirely visual ({{!}} and the like).

This type of error may also occur in identifier-based templates ({{cite doi}}, etc.). When this happens, the error message is shown in the article but the error is actually located in the identifier-based citation template.

To resolve this error, remove wikilinks from title-holding parameters that are intended to be externally linked or remove the external URL, which will allow the internal wikilinks to work as expected. If wikilink-producing templates are important to the citation, move them out of the CS1 template but leave them inside the citation's வார்ப்புரு:tag tags. Some of the functionality provided by templates may also be available through CS1 parameters.

To resolve errors in identifier-based citation templates, the template must be edited to correct the error. Exercise caution when editing these templates because identifier-based citation templates are often used in multiple articles.

Pages with this error are automatically placed in Category:CS1 errors: URL–wikilink conflict.

Vancouver style error

This error is reported for citations that use வார்ப்புரு:para, வார்ப்புரு:para, வார்ப்புரு:para.

Vancouver style restricts author or editor names to the Latin alphabet. For the purposes of this test, Module:Citation/CS1 defines the Latin alphabet as the letters defined in the Unicode Latin character sets:

C0 Controls and Basic Latin (0041–005A, 0061–007A)

C1 Controls and Latin-1 Supplement (00C0–00D6, 00D8–00F6, 00F8–00FF)

Latin Extended-A (0100–017F)

Latin Extended-B (0180–01BF, 01C4–024F)

This error is also reported when more than two initials are used: in case of more than two initials, list only the first two.

This error is also reported when a corporate or institutional author is listed in வார்ப்புரு:para without proper delimiters. Corporate authors should be listed this way:

வார்ப்புரு:para

While normally correct, sometimes the names listed on a PMID page contain errors when the author surname has a lowercase nobiliary particle. For example, வார்ப்புரு:PMID lists Magnus von Knebel Doeberitz as Doeberitz Mv which is not correct. This author's name should be listed as வார்ப்புரு:para.

Certain punctuation will be flagged as an error. For example, Unicode U+2019, right single quotation mark, causes an error because it is not a member of the Latin character sets identified above: வார்ப்புரு:para. Replace this character with the straight (or typewriter) apostrophe: வார்ப்புரு:para.

To resolve this error, Romanize author and editor names. Romanizing can result in two-letter initials, for example, the Greek letter 'Θ' Romanizes to 'Th'. When author names have this kind of initial, Module:Citation/CS1 can't know if this kind of initial is a typo or a legitimate Romanized character so it will emit the Vancouver error. To suppress the error after determining that the two-character initial is correct and not a typo, treat the name as if it were a corporate name by wrapping it in doubled parentheses: வார்ப்புரு:para → வார்ப்புரு:para

Similarly, Chinese hyphenated given names may appear in PubMed listings. For example: 'Wang Hsien-yu' may be listed on PubMed as 'Wang Hy' which will result in a Vancouver error. When this occurs, and upon verification that such names are correct, wrap them in doubled parentheses.

Specific Rules for Names:

• Surnames with hyphens and other punctuation in them
• Other surname rules
• Given names containing punctuation, a prefix, a preposition, or particle
• Degrees, titles, and honors before or after a personal name
• Designations of rank within a family, such as Jr and III
• Names appearing in non-roman alphabets (Cyrillic, Greek, Arabic, Hebrew, Korean) or character-based languages (Chinese, Japanese)
• Organizations as author
  • cs1|2 does not obey the semicolon-as-separator rule. Separate corporate and organizational names from each other and from individual names with a comma; wrap corporate and organizational names in doubled parentheses as described above

Pages with this error are automatically placed in Category:CS1 errors: Vancouver style.

<char> character in |<param>= at position n

This error is reported for citations with parameter values that contain invisible or non-printable characters known as control characters; the error includes the position at which the character can be found. Module:Citation/CS1 detects parameter values that contain any of these characters:

• replacement character, U+FFFD
• hair space, U+200A
• zero width space, U+200B
• zero width joiner, U+200D
• soft hyphen, U+00AD
• horizontal tab, U+0009 (HT)
• line feed, U+0010 (LF)
• carriage return, U+0013 (CR)
• delete character, U+007F (DEL)
• C0 control, U+0000–U+001F (NULL–US)
• C1 control, U+0080–U+009F (XXX–APC)

To resolve invisible-character errors, remove or replace the identified character. Because these characters are mostly invisible, the error message identifies the character's position in the parameter value counted from the left. Space characters between the assignment operator (the '=' sign) and the parameter value are not counted. If you move through the citation with the arrow keys then the cursor may stand still once at an invisible character which can be removed with வார்ப்புரு:keypress or வார்ப்புரு:keypress. If you copy-paste a string to the "Characters" field at https://r12a.github.io/app-conversion/ and click "View in UniView" then the position and name of all characters is shown.

Strip markers are special sequences of characters that MediaWiki inserts as a place-holder for certain xml-like tags. These tags include வார்ப்புரு:tag, வார்ப்புரு:tag, வார்ப்புரு:tag, வார்ப்புரு:tag, and வார்ப்புரு:tag. The strip markers are replaced with content before the final page rendering. The module ignores math and nowiki strip markers.

To resolve strip marker errors, remove or replace the identified tag. The error message identifies the strip marker's position in the parameter value counted from the left. Space characters between the assignment operator (the '=' sign) and the parameter value are not counted.

Strip marker errors can also be caused by unsupported additional text or templates in parameter valuesவார்ப்புரு:mdashfor example, {{ISBN}} in வார்ப்புரு:para. Resolve the problem by moving the extraneous text outside of the citation template or by removing the extraneous text or template markup, as appropriate.

Pages with this error are automatically placed in Category:CS1 errors: invisible characters.

|<param>= requires |doi=

When any of வார்ப்புரு:para, வார்ப்புரு:para, or வார்ப்புரு:para are used in a cs1|2 template, வார்ப்புரு:para or வார்ப்புரு:para (with value) must also be present.

To resolve this error, either add the missing DOI or remove the 'broken' parameter.

Pages with this error are automatically placed in Category:CS1 errors: DOI.

|<param>-access= requires |<param>=

This error is reported when an access level has been specified for some external link, but the corresponding required parameter is missing or empty. The parameter can be one of

access-level specifier required parameter

specifier	required parameter
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para
வார்ப்புரு:para	வார்ப்புரு:para

To resolve this error, either provide a value for the parameter, or remove the access level specification.

Pages with this error are automatically placed in Category:CS1 errors: param-access.