Listen failure: unsupported operand type(s) for |: 'NoneType' and 'int'

[git1e]

启动监听失败。
D:\Python\rest_xops\Scripts\python.exe G:/PycharmProjects/rest_xops/manage.py runserver 8000
Performing system checks...

System check identified no issues (0 silenced).
June 14, 2020 - 19:44:42
Django version 2.1.7, using settings 'rest_xops.settings'
Starting ASGI/Channels version 2.1.7 development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Listen failure: unsupported operand type(s) for |: 'NoneType' and 'int'