'WebSocketProtocol' object has no attribute 'application_queue' error Django Channels - django

Question

In my Django project I want to create a chat app using channels.But when I followed this tutorial:
https://channels.readthedocs.io/en/stable/tutorial/part_2.html , I had a problem that websocket auto disconnect after connect :
Exception in callback AsyncioSelectorReactor.callLater.<locals>.run()
at
C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\twisted\internet\asyncioreact
or.py:287 handle: <TimerHandle when=19405.993
AsyncioSelectorReactor.callLater.<locals>.run() at
C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\twisted\interne
t\asyncioreactor.py:287> Traceback (most recent call last): File
"C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\asyncio\events.py",
line 145, in _run
self._callback(*self._args) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\twisted\internet\asyncioreactor.py",
line 290, in run
f(*args, **kwargs) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\twisted\internet\tcp.py",
line 289, in connectionLost
protocol.connectionLost(reason) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\autobahn\twisted\websocket.py",
line 128, in connectionLost
self._connectionLost(reason) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\autobahn\websocket\protocol.py",
line 2467, in _connectionLost
WebSocketProtocol._connectionLost(self, reason) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\autobahn\websocket\protocol.py",
line 1096, in _connectionLost
self._onClose(self.wasClean, WebSocketProtocol.CLOSE_STATUS_CODE_ABNORMAL_CLOSE, "connection was
closed uncleanly (%s)" % self.wasNotCleanReason) File
"C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\autobahn\twisted\websocket.py",
line 171, in _onClose
self.onClose(wasClean, code, reason) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\site-packages\daphne\ws_protocol.py",
line 146, in onClose
self.application_queue.put_nowait({ AttributeError: 'WebSocketProtocol' object has no attribute 'application_queue'

Answer 1

Above this error should be a list of paths and at the top of that paths are the real error. In my case it was the routing url.

Answer 2

migration solve it for me
python manage.py migrate

Answer 3

Just to clarify this error for everyone who faces it while following the channels tutorial for me the error was in my path
2018-05-17 15:55:36,382 - ERROR - ws_protocol - [Failure instance:
Traceback: : No route found for path
'ws/chat/me/'.
You can find it on top of the stacktrace
My defined invalid URL pattern "buzz" because I like to change things up. Essentially it works the same way as django url patterns so just need to make sure that your routing structure matches what you specify.
websocket_urlpatterns = [
url(r'^ws/buzz/(?P<room_name>[^/]+)/$', consumers.ChatConsumer),
]
In my case the route path did not match my websocket patterns
I had to update the route path to be correct -> by changing my websocket_urlpatterns back to chat
websocket_urlpatterns = [
url(r'^ws/chat/(?P<room_name>[^/]+)/$', consumers.ChatConsumer),
]
So the system could resolve my issue. Hopefully it helps people who run into this in the future. Good luck. P.T.