General Scheduling error

When you try to create a new appointment, It shows the error message "General Scheduling error" . If trace is enabled, the below error is recorded in the trace.     

"Inner Exception: System.Data.SqlClient.SqlException: Violation of UNIQUE KEY constraint 'UQ_PrincipalObjectAccess'. Cannot insert duplicate key in object 'dbo.PrincipalObjectAccess'."


The solution for this is to install the hotfix .

http://support.microsoft.com/kb/956129

In our case, the above hotfix has resolved the issue.

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