Help:Cite errors/Cite error references missing key

All references defined in the reference list must be invoked in the content. Unused references must be removed or commented out.

Including more than one nested reference in List-defined references will cause a Cite error.

Misusing a template that was never intended as a citation template and placing it in <ref> tags may cause this issue.

Ex. 1) There are three references defined in the list, but none are invoked in the content. Note the spurious error for the first reference named ipsum:



Ex. 2) If only one reference is defined but not invoked, then only the spurious error is shown:

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.[1] Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.[2]

Cite error: A list-defined reference with group name "" is not used in the content (see the help page).

Pages with this error message are placed into Pages with incorrect ref formatting. The system message page is at Cite error references missing key.