The schemaIdGuid attribute value for the following schema class duplicates the schemaIdGuid value for an existing class. ...

The schemaIdGuid attribute value for the following schema class duplicates the schemaIdGuid value for an existing class.  
  
Class:
%1 (%2)  
Existing class:
%3 (%4)  
  
Both classes are considered defunct (as if the isDefunct attribute value were TRUE). The condition will resolve itself after the schema directory partition has replicated successfully.  
  
User Action  
If this event continues to occur, initiate a replication cycle with all replication partners of the local domain controller. If the condition persists, deactivate one of the above classes by setting the isDefunct value to TRUE.