Invalid class string(sql server 2008 R2)
i have been designing database but when i click on database diagram this message is popping up"Invalid class string
 (MS Visual Database Tools)"
July 2nd, 2015 9:35am

Hi Anonymous1',

The issue could be due to corrupted registry of SQL Server Management Studio (SSMS), I recommend you uninstall and reinstall SSMS.

There is a similar thread for your reference.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/939e9cd7-a4de-47af-a14e-8fc6e8dc6583/database-diagram-invalid-class-string?forum=sqltools

Thanks,
Lydia Zhang

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July 2nd, 2015 10:45pm

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