django channels

Error generado al correrlo

(src) debian@debian:~/Escritorio/mysite$ python manage.py  runserver
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
September 17, 2019 - 15:27:14
Django version 2.2.3, using settings 'mysite.settings'
Starting ASGI/Channels version 2.2.0 development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
HTTP GET /chat/lobby/ 200 [0.02, 127.0.0.1:46054]
[Failure instance: Traceback: <class 'ValueError'>: No route found for path 'ws/chat/lobby/'.
/home/debian/Escritorio/src/lib/python3.7/site-packages/autobahn/websocket/protocol.py:2844:processHandshake
/home/debian/Escritorio/src/lib/python3.7/site-packages/txaio/tx.py:429:as_future
/home/debian/Escritorio/src/lib/python3.7/site-packages/twisted/internet/defer.py:151:maybeDeferred
/home/debian/Escritorio/src/lib/python3.7/site-packages/daphne/ws_protocol.py:82:onConnect
--- <exception caught here> ---
/home/debian/Escritorio/src/lib/python3.7/site-packages/twisted/internet/defer.py:151:maybeDeferred
/home/debian/Escritorio/src/lib/python3.7/site-packages/daphne/server.py:200:create_application
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/staticfiles.py:41:__call__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/routing.py:58:__call__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/sessions.py:47:__call__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/sessions.py:145:__call__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/sessions.py:169:__init__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/middleware.py:31:__call__
/home/debian/Escritorio/src/lib/python3.7/site-packages/channels/routing.py:154:__call__
]
WebSocket DISCONNECT /ws/chat/lobby/ [127.0.0.1:46058]
Not Found: /ws/chat/lobby/






# Este es el routing en proyecto
# mysite/routing.py
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
        )
    ),
})



## Esta es el routing en app:
# chat/routing.py
from django.urls import path

from . import consumers

websocket_urlpatterns = [
    path('ws/chat/<str:room_name>/$', consumers.ChatConsumer),
]


este es el consumers.py
# chat/consumers.py
from channels.generic.websocket import WebsocketConsumer
import json

class ChatConsumer(WebsocketConsumer):
    def connect(self):
        self.accept()

    def disconnect(self, close_code):
        pass

    def receive(self, text_data):
        text_data_json = json.loads(text_data)
        message = text_data_json['message']

        self.send(text_data=json.dumps({
            'message': message
        }))