MediaWiki:Nosuchspecialpage/qqq

The title of the error you get when trying to open a special page which does not exist. The text of the warning is this message:

nospecialpagetext ("<strong>You have requested an invalid special page.</strong> A list of valid special pages can be found at [[Special:SpecialPages|{{int:specialpages}}]].").

Example: Special:Nosuchpage