ORA-32829: Messaging Gateway agent cannot be shut down while it is starting
Cause: An attempt was made to shut down the Messaging Gateway agent when it is in the process of starting and initializing
Action: Wait for MGW_GATEWAY view to show a RUNNING status and retry the operation. CLEANUP_GATEWAY may need to be issued to reset the gateway state if the agent fails to start after a reasonable time period
https://support.oracle.com/
http://www.oracle.com/