| ERROR | cannot specify agent with NULL address and non-NULL protocol |
| CAUSE | An ADD_SUBSCRIBER or enqueue was attemoted with an agent that had a NULL address and a non-NULL protocol. |
| ACTION | Either specify a non-NULL address or set the protocol to NULL. |
| ERROR | cannot specify agent with NULL address and non-NULL protocol |
| CAUSE | An ADD_SUBSCRIBER or enqueue was attemoted with an agent that had a NULL address and a non-NULL protocol. |
| ACTION | Either specify a non-NULL address or set the protocol to NULL. |