{ "topic": "unknown/unknown/policies/errors", "headers": { "content-type": "application/vnd.eclipse.ditto+json" }, "path": "/", "value": { "status": 400, "error": "policies:subjectid.invalid", "message": "Subject ID 'invalid subject' is not valid!", "description": "It must contain an issuer as prefix separated by a colon ':' from the actual subject" }, "status": 400 }