Week 5 - UnboundLocalError: local variable 'ddb' referenced before assignment

Error [2023-04-30 17:46:44,787] ERROR in app: Exception on /api/message_groups [GET] Traceback (most recent call last): ... File "/backend-flask/app.py", line 209, in data_message_groups model = MessageGroup.run(cognito_user_id=cognito_user...