An unexpected error occurred when trying to fetch presence policies. This will be retried, but if this error continues to ...

An unexpected error occurred when trying to fetch presence policies. This will be retried, but if this error continues to occur, the Lync Server service will need to be restarted.

Error code: %1
Cause: Server is low on resources.
Resolution:
Ensure that the server meets minimum hardware requirements and is not overloaded.