FCM Errors fails at runtime

we have been changing a lot of the code in sandbox and when we try and compile all of the code using ./start.py run we get the following error:

fcm_2 | _GatheringFuture exception was never retrieved
fcm_2 | future: <_GatheringFuture finished exception=ConnectionRefusedError(111, ‘Connection refused’)>
fcm_2 | Traceback (most recent call last):
fcm_2 | File “/app/fcc_telemetry.py”, line 59, in run_non_blocking
fcm_2 | super().run_non_blocking()
fcm_2 | File “/usr/local/lib/python3.9/site-packages/bell/avr/mqtt/client.py”, line 273, in run_non_blocking
fcm_2 | self._mqtt_client.connect(host=self.mqtt_host, port=self.mqtt_port, keepalive=60)
fcm_2 | File “/usr/local/lib/python3.9/site-packages/paho/mqtt/client.py”, line 914, in connect
fcm_2 | return self.reconnect()
fcm_2 | File “/usr/local/lib/python3.9/site-packages/paho/mqtt/client.py”, line 1044, in reconnect
fcm_2 | sock = self._create_socket_connection()
fcm_2 | File “/usr/local/lib/python3.9/site-packages/paho/mqtt/client.py”, line 3685, in _create_socket_connection
fcm_2 | return socket.create_connection(addr, timeout=self._connect_timeout, source_address=source)
fcm_2 | File “/usr/local/lib/python3.9/socket.py”, line 844, in create_connection
fcm_2 | raise err
fcm_2 | File “/usr/local/lib/python3.9/socket.py”, line 832, in create_connection
fcm_2 | sock.connect(sa)
fcm_2 | ConnectionRefusedError: [Errno 111] Connection refused

any help to get stabilized flight working would be appreciated
thank you