The article had in the text a category before the last headline. Category should written at the end of the article before the interwikis.
<span style="color:#e80000;">This is a new error. If you find a bug then please tell this [[:de:Benutzer Diskussion:Stefan Kühn/Check Wikipedia|here]].</span>
This error was found '''1''' times. - [http://toolserver.org/~sk/checkwiki/fiwiki/fiwiki_error_list_error_052.html List of all articles with error 052]
See this error with the [http://toolserver.org/~sk/cgi-bin/checkwiki/checkwiki.cgi?project=fiwiki&view=only&id=052 new interface].