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As the answer were in another thread: https://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=149428 the problem was with content that only existed in tblContent and not in tblContentLanguage.
I used another way to find it that is faster but is depending on that you have access to the database.
To be able to find if you have this problem run this command:
Select * From tblContent c left outer join tblContentLanguage cl on c.pkID = cl.fkContentID Where cl.fkContentID is null
After we updated to latest version of Episerver (from 11 to 11) we get this message when trying to sett access rights.
Anyone else seen this?