TypeError: объект 'NoneType' не является вызываемым django websockets

я пытаюсь добавить функцию уведомления в мой проект. но когда я пытаюсь подключиться с помощью postman, я получаю TypeError: 'NoneType' object is not callable. я понятия не имею, почему я получаю эту ошибку. ошибка даже не указывает на строку в моем коде. это мой consumers.py

import json
from channels.generic.websocket import WebsocketConsumer
from asgiref.sync import async_to_sync

class NotificationConsumer(WebsocketConsumer):
    def connect(self):
        self.room_name = self.scope['url_route']['kwargs']['user_id']
        user = self.scope['user']
        if self.room_name == user:
            async_to_sync(self.channel_layer.group_add)(
            self.room_name,
            self.channel_name
            )
            self.accept()
        return


    async def disconnect(self, code):
        return await self.close()

    def receive(self, text_data=None):
        return

    def send_notifications(self, event):
        data = json.loads(event.get('value'))
        self.send(text_data=json.dumps({'payload':data}))
        

вот мой routing.py

from django.urls import re_path

from .consumers import NotificationConsumer

websocket_urlpatterns = [
    re_path(r'ws/notification/(?P<user_id>\w+)/$', NotificationConsumer.as_asgi()),
]

это мой channelsmiddleware.py

from django.db import close_old_connections
from rest_framework_simplejwt.tokens import UntypedToken
from rest_framework_simplejwt.exceptions import InvalidToken, TokenError
from jwt import decode as jwt_decode
from clothRentalBackend import settings
from django.contrib.auth import get_user_model
from urllib.parse import parse_qs
 
 
class TokenAuthMiddleware:
    """
    Custom token auth middleware
    """
 
    def __init__(self, inner):
        # Store the ASGI application we were passed
        self.inner = inner
 
    def __call__(self, scope):
 
        # Close old database connections to prevent usage of timed out connections
        close_old_connections()
 
        # Get the token
        token = parse_qs(scope["query_string"].decode("utf8")).get("token")[0]
 

        try:

            UntypedToken(token)
        except (InvalidToken, TokenError) as e:

            print(e)
            return None
        else:

            decoded_data = jwt_decode(token, settings.SECRET_KEY, algorithms=["HS256"])

            user = get_user_model().objects.get(id=decoded_data["id"])
 
        return self.inner(dict(scope, user=user))

Я получаю следующую ошибку, когда пытаюсь подключиться, передав токен по адресу ws://localhost:8000/ws/notification/1/?token=<jwt_token>

error:

WebSocket HANDSHAKING /ws/notification/1/ [127.0.0.1:37906]
Token has no id
Exception inside application: 'NoneType' object is not callable
Traceback (most recent call last):
  File "/home/rijan/Desktop/projects/fyp/django/clothRentalBackend/env/lib/python3.8/site-packages/channels/staticfiles.py", line 44, in __call__
    return await self.application(scope, receive, send)
  File "/home/rijan/Desktop/projects/fyp/django/clothRentalBackend/env/lib/python3.8/site-packages/channels/routing.py", line 71, in __call__
    return await application(scope, receive, send)
  File "/home/rijan/Desktop/projects/fyp/django/clothRentalBackend/env/lib/python3.8/site-packages/asgiref/compatibility.py", line 34, in new_application
    return await instance(receive, send)
TypeError: 'NoneType' object is not callable
WebSocket DISCONNECT /ws/notification/1/ [127.0.0.1:37906]

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