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pythondjangodjango-channels

No module named 'asgiref.base_layer'

When starting my server (python manage.py run server) I get the following error.

File "/Users/thomasallen/PycharmProjects/Channels_and_Signals/venv/lib/python3.9/site-packages/asgi_redis/core.py", line 19, in from asgiref.base_layer import BaseChannelLayer ModuleNotFoundError: No module named 'asgiref.base_layer'

The offending line 19 in .../core.py is

from asgiref.base_layer import BaseChannelLayer

The packages I have installed are: Django 3.2.4 channels 3.0.3 channels-redid 3.2.0 aspired 3.3.4 asgi-redis 1.1.0

I'm not sure where the mismatch is.

Solution

  • It's because asgi_redis 1.1.0 depends on an old version of asgiref (listed without an upper bound as asgiref>=1.0.0 in their setup.py) which used to have this code. But you have a more recent version installed because Django depends on asgiref >= 3.3.2.

    You shouldn't have both asgi_redis and channels_redis installed, they are different versions of the same package. See note in the channels_redis git repo:

    Note: Prior versions of this package were called asgi_redis and are still available under PyPI as that name if you need them for Channels 1.x projects. This package is for Channels 2 projects only.

    Your solution is to not use asgi_redis and use channels_redis instead.