runtime error

Space failed. Exit code: 1. Reason: Traceback (most recent call last): File "/home/user/app/app.py", line 38, in <module> controller_url = os.environ['controller_url'] File "/usr/local/lib/python3.10/os.py", line 680, in __getitem__ raise KeyError(key) from None KeyError: 'controller_url'

Container logs: