│ You are using `-A` as an option of the worker sub-command: │
│ celery worker -A celeryapp <...> │
│ │
│ The support for this usage was removed in Celery 5.0. Instead you should use `-A` as a global option: │
│ celery -A celeryapp worker <...> │
│ Usage: celery worker [OPTIONS] │
│ Try 'celery worker --help' for help. │
│ │
│ Error: No such option: -A │
│ Stream closed EOF for default/penn-courses-celery-696bd7b6fb-8xzjs (worker)
^ including this context for posterity