The Subscription expiration stored procedure failed. It will be retried, but if this error continues to occur, the Lync Server ...

The Subscription expiration stored procedure failed. It will be retried, but if this error continues to occur, the Lync Server service will need to be restarted.

Error code: %1 NativeError: %2
Cause: Possible issues with back-end database.
Resolution:
Check the eventlog description for more information about the problem. Ensure that the database server is running and there is no database connectivity issue.