change log output

ml/thing.py

@@ -460,8 +460,8 @@ def __send_message_to_broker(self, receiver_endpoints, msg):
             APP_LOGGER.info(__log)
             return res
 
-        except s3i.exception.S3IBrokerAMQPError:
-            __log = "[S3I]: Invalid request sender endpoint {}".format(receiver_endpoints)
+        except s3i.exception.S3IBrokerAMQPError as e:
+            __log = "[S3I]: {}".format(e.error_msg)
             APP_LOGGER.critical(__log)
 
     def on_user_message(self, msg):