Oracle® Database 11g / 12c / 18c error codes ORA-32852: agent [string] is referenced by a message system link

ORA-32852: agent [string] is referenced by a message system link

Oracle Error Code: ORA-32852

Cause: An attempt was made to remove a Messaging Gateway agent currently referenced by one or more message system links.

Action: Remove all message system links associated with this agent and retry the operation.