Hello, I was trying to upgrade from v.1.15 to 1.22. So I download the new MediaWiki archive and inserted the data in the folder to the old 1.15 folder @htdocs/mediawiki Now when trying to navigate in the browser to the url: http://localhost/smartcards/mw-config/ I will only get the error message : "Fatal error: Cannot redeclare wfProfileIn() (previously declared in C:\xampp\htdocs\smartcards\includes\profiler\Profiler.php:33) in C:\xampp\htdocs\smartcards\includes\ProfilerStub.php on line 24" Can I get help here please? Sorry for my English! Kind regards David Wohlauf _______________________________________________ MediaWiki-l mailing list MediaWiki-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/mediawiki-l