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hello,
the error message I used to get id gone, but I get another, When I try to backup my database I get an error saying
invalid object name sys.tables
invalid object name sys.objects
invalid object name sys.assembly_modules
invalid object name sys.triggers
invalid object name sys.sql_modules
invalid object name sys.system_sql_modules
invalid object name sys.schemas.

It happens when I rightclick my database en chose backup, I then chose backup folder, when I click next I get a please wait message, and after a few seconds this error message appears.