Cause:  This is caused by Group Policy attempting to link a Group Policy object to an organizational unit that it cannot find. The organizational unit might be deleted, or it might be created on another domain controller but not replicated to the domain controller that you are using.

Solution:  Limit the number of administrators who can make structural changes to Active Directory, or who can edit a Group Policy object, at any one time. Allow changes to replicate before making changes that affect the same organizational unit or Group Policy object.