Arena Exception

Whoops, looks like something went wrong.
404 - Not Found

We are terribly sorry to display this page. If this error persist even after the restart of Arena, you may want to report the problem on our Arena Support page.

Additional information you have to submit along with your problem description:
Arena version: 1.5.78.1 (Remote: 1.5.93.4)
Branch:
Error URL: http://www.fijlkamgarelotta.it/it/sport-event/show/717d21ae-dd65-11e8-b9fd-005056bf750b
Message: App\Entity\SportEvent object not found by the @ParamConverter annotation.