| Exception | Description | 
| nonmasterdef | The invocation site is not the masterdef site. | 
| missingrepgroup | The given replicated object group does not exist. | 
| missingpriority | The given site priority group does not exist | 
| missingvalue | The old site is not a group member. | 
| duplicatesite | The new site already exists in the group with a different priority level. |