A request for the specific Dial Plan failed because the profile is not known. User %1 requested an unknown Dial Plan named ...

A request for the specific Dial Plan failed because the profile is not known.

User %1 requested an unknown Dial Plan named '%2'. This Dial Plan name may have been specified in group policy or selected by some other means available to the user. Dial Plan requests that fail for this user will not be reported again for another hour.
Cause: Lync Server clients that are enabled for Unified Communications may request the details of a specific Dial Plan based on group policy settings or based on user selection.
Resolution:
Review group policy settings for this user and ensure the specified Dial Plan has been defined in the system.