Setup fails with KeyError: 'WERKZEUG_SERVER_FD'

Output of the ue4-docker info command:

anip@blade:~/codes$ ue4-docker info
/usr/lib/python3/dist-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.9) or chardet (3.0.4) doesn't match a supported version!
  warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
ue4-docker version:         0.0.96 (latest available version is 0.0.96)
Operating system:           Linux (Ubuntu 20.04.3 LTS, 5.13.0-37-generic)
Docker daemon version:      20.10.14
NVIDIA Docker supported:    Yes
Maximum image size:         No limit detected
Available disk space:       150.23 GiB
Total system memory:        15.53 GiB physical, 2 GiB virtual
CPU:                        6 physical, 12 logical (x86_64)

Additional details:

I am trying to run setup with sudo ue4-docker setup.

I get the error:

anip@blade:~/codes$ sudo ue4-docker setup
/usr/lib/python3/dist-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.9) or chardet (3.0.4) doesn't match a supported version!
  warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
Process Process-1:
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/infrastructure/CredentialEndpoint.py", line 84, in _endpoint
    server.run(host="0.0.0.0", port=9876)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 920, in run
    run_simple(t.cast(str, host), port, self, **options)
  File "/usr/local/lib/python3.8/dist-packages/werkzeug/serving.py", line 1047, in run_simple
    fd = int(os.environ["WERKZEUG_SERVER_FD"])
  File "/usr/lib/python3.8/os.py", line 675, in __getitem__
    raise KeyError(key) from None
KeyError: 'WERKZEUG_SERVER_FD'
Traceback (most recent call last):
  File "/usr/local/bin/ue4-docker", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/main.py", line 112, in main
    COMMANDS[command]["function"]()
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/setup_cmd.py", line 156, in setup
    _setupLinux()
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/setup_cmd.py", line 19, in _setupLinux
    endpoint.start()
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/infrastructure/CredentialEndpoint.py", line 53, in start
    raise RuntimeError("failed to start the credential endpoint")
RuntimeError: failed to start the credential endpoint

• Are you accessing the network through a proxy server? Yes/No No

(The rest of the issue description goes here. If you’re reporting a problem with building container images, be sure to include the full output of the ue4-docker build command, including the initial output lines that display the command line parameters used to invoke the build. If you’re making a feature request, you can remove the template contents entirely, since the ue4-docker info output and related information is only needed for helping diagnose and reproduce bugs.)

[slonopotamus]

Actually, using whole Flask for a single HTTP endpoint sounds like a bit of an overkill.

[Polterageist]

Hi! It is a bug in dependency. I found workaround. Just install werkzeug package with forced 2.0.0 version. I’m using pipenv so for me it just: pipenv install werkzeug==2.0.0