Help:Cite errors/Cite error ref no key

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• If you need help with a particular problem, please discuss it on the article talk page.
• If you have read this help page and find something missing or confusing, please discuss it at the main talk page.
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Overview

A footnote used multiple times may be defined with a name:

<ref name="foo">content</ref>

To invoke a named footnote:

<ref name="foo" />

Issues and resolution

A named reference has a malformed name. This is produced by a construct like <ref /> or by an invalid footnote name; either create a full reference such as <ref>content</ref> or give the tag a name like <ref name="refname" />.

Names

Names for footnotes and groups must follow these rules: Names

• are case-sensitive
• Names may not be purely numeric
• Quotes are optional if the only characters used are letters A–Z, a–z, digits 0–9 and the symbols !$%&()*,-.:;<@[]^_`{|}~
• Inclusion of any other characters including spaces requires that the name be enclosed in straight quotes (")
• Quote-enclosed names may not include a less-than sign (<) or a quote symbol (")
• Please consider keeping names simple and restricted to the standard English alphabet and numerals.
• You may optionally provide names even when the name is not required.

Technical

This page will help you to fix the error message:

• If you need help with a particular problem, please discuss it on the article talk page.
• If you have read this help page and find something missing or confusing, please discuss it at the main talk page.
• Please reference this page and the page where you have the problem so we can understand your issues.