The website encountered an unexpected error…. (caused by File_entity)

When I enable “File_entiyy” module, the site complains “The website encountered an unexpected error. Please try again later.”

When I disable the File_entity, the site is fine.
I have been searching to find a solution, but did not find a straight forward suggestion.

File entity, Media, Media Internet Sources are Version: 7.x-1.6
Media: YouTube is Version: 7.x-3.0
All modules are now disabled since I can not use them without file_entity.

Thank you and I hope somebody could help.
BR
Tatariw

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