I am getting the following error in the system message log over and over:

The assignment web service encountered the following exception while
handling "getEffectiveAssignments"
request for
6fb1779560e84d5be2bc46096f0ef846~01986d978406d611b b9400b0d0e1ee50:
Invalid assignment type: Policies/Users

the rest of the Detials are:

additional information : None
source: /devices/servers/Primary-server-name
Message ID: assigmentService.GENERAL_EXCEPTION
Probable Cause URL: None
Related Object: NONE.

Would anyone be able to point me in the right direction to find out what
is happening here?
I am also having great problems with User policies and bundles not being
distributed to any clients.
Perhaps this is connected?

ZCM 10.2.1 running on Windows 2003R2 SP2

Many Thanks