How to remove this error 'No application configured for scope type 'websocket''

Question

I am trying to build a chat app with Django but when I try to run it I get this error

No application configured for scope type 'websocket'

my routing.py file is

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter , URLRouter
import chat.routing

application = ProtocolTypeRouter({
    # (http->django views is added by default)
    'websocket':AuthMiddlewareStack(
        URLRouter(
            chat.routing.websocket_urlpatterns
        )
    ),
})

my settings.py is

ASGI_APPLICATION = 'mychat.routing.application'
CHANNEL_LAYERS = {
    'default': {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {
            "hosts": [('127.0.0.1', 6379)],
        },
    },
}

when I open my URL in 2 tabs I should be able to see the messages that I posted in the first tab appeared in the 2nd tab but I am getting an error

[Failure instance: Traceback: <class 'ValueError'>: No application configured for scope type 'websocket'
/home/vaibhav/.local/lib/python3.6/site-packages/autobahn/websocket/protocol.py:2801:processHandshake
/home/vaibhav/.local/lib/python3.6/site-packages/txaio/tx.py:429:as_future
/home/vaibhav/.local/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred
/home/vaibhav/.local/lib/python3.6/site-packages/daphne/ws_protocol.py:82:onConnect
--- <exception caught here> ---
/home/vaibhav/.local/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred
/home/vaibhav/.local/lib/python3.6/site-packages/daphne/server.py:198:create_application
/home/vaibhav/.local/lib/python3.6/site-packages/channels/staticfiles.py:41:__call__
/home/vaibhav/.local/lib/python3.6/site-packages/channels/routing.py:61:__call__
]
WebSocket DISCONNECT /ws/chat/lobby/ [127.0.0.1:34724]

I couldn't find a duplicate of this question on stackoverflow

Answer 1

problem could be in the asgi.py :

application = ProtocolTypeRouter({ "http": get_asgi_application(), "websocket": AuthMiddlewareStack( URLRouter( chat.routing.websocket_urlpatterns ) ), # Just HTTP for now. (We can add other protocols later.) })

Answer 2

Those using centos,My issue was with redis. My system had redis version 3 updating it to redis version 6 or above got my django channels working. Redis was breaking in the background. Hope it helps