| Exception | Description | 
| nonmasterdef | The invocation site is not the masterdef site. | 
| missingrepgroup | The given replicated object group does not exist. | 
| missingpriority | The old priority level is not associated with any group members. | 
| duplicatepriority | The new priority level already exists for another site in the group. | 
| missingvalue | The old value does not already exist. | 
| paramtype | The new value has the incorrect datatype for the priority group. |