Server Error when upgrading to 1.11

I upgraded to 1.11 of piwik and I try sign in to my admin account and I receive this error:

Is there any way of fixing this error?


EDIT: I searched this problem on google and the results don’t seem to match my problem.

Check your error logs please.

EDIT: I tried reinstalling but its not working.

Please delete the UserLanguage plugin from the plugins folder (after deactivating it in the UI)