Thread:Project:Support desk/Fatal error: Class 'XXXXXXXX' not found/reply (5)

By the way, I've tried to run http://molwiki.org/w/mw-config/ without upgrading files on the server, and after pressing "continue ->" button it shows me exactly the same error: "Fatal error: Class 'ConfirmAccountUISetup' not found in /usr/www/users/unexpr/w/extensions/ConfirmAccount/ConfirmAccount.php on line 42". Any suggestions?