reported messages leads to error 500

when viewing a report, the link on the title of the topic lead to this URL:

https://myserver.com/community/modcp/reports/592/?&action=find&parent=1

Which gives error 500 instead of taking me to the topic:

Fatal error: Cannot declare class IPS\convert\Software\Forums\Vbulletin because the name is already in use in /home/user/public_html/community/applications/convert/sources/Software/Forums/Vbulletin.php on line 47