ValueError: HTTP response has not yet been started but got http.response.body - web page is freezing on loading.

Hi
I am facing an issue which I am trying to resolve for quite a long time now.
**Background**
The integration of Daphne with Django and Channels "was working" fine but suddenly stopped working, and I am getting the problem "ValueError: HTTP response has not yet been started but got http.response.body" which I can not resolve. I have ws endpoint which trigger the consumer make celery task calls, I simplified the consumer to the minimum to check if the problem disappear but no luck.
The setup I had it with Django 2 but upgraded to Django 3 to solve the problem but same problem.

channels == 3.0.0
django == 3.1.3
channels-redis == 3.2.0

```
/static/tradeplatform/styles/scss/dashboard.css' http.response.body
Start writing request
Stop writing request
{'type': 'http.response.body'}
127.0.0.1:33644 - - [04/Nov/2020:12:20:11] "GET /static/tradeplatform/styles/scss/dashboard.css" 304 -
b'/static/jquery/dist/jquery.min.js' http.response.start
b'/static/jquery/dist/jquery.min.js' http.response.body
Start writing request
Stop writing request
{'type': 'http.response.body'}
127.0.0.1:33644 - - [04/Nov/2020:12:20:11] "GET /static/jquery/dist/jquery.min.js" 304 -
2020-11-04 12:20:12,537 ERROR Exception inside application: HTTP response has not yet been started but got http.response.body
Traceback (most recent call last):
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/channels/routing.py", line 71, in __call__
return await application(scope, receive, send)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/channels/http.py", line 200, in __call__
await self.handle(body_stream)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/asgiref/sync.py", line 304, in __call__
ret = await asyncio.wait_for(future, timeout=None)
File "/usr/lib/python3.8/asyncio/tasks.py", line 455, in wait_for
return await fut
File "/usr/lib/python3.8/concurrent/futures/thread.py", line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/asgiref/sync.py", line 343, in thread_handler
return func(*args, **kwargs)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/channels/http.py", line 258, in handle
self.send(response_message)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/asgiref/sync.py", line 147, in __call__
return call_result.result()
File "/usr/lib/python3.8/concurrent/futures/_base.py", line 432, in result
return self.__get_result()
File "/usr/lib/python3.8/concurrent/futures/_base.py", line 388, in __get_result
raise self._exception
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/asgiref/sync.py", line 212, in main_wrap
result = await self.awaitable(*args, **kwargs)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/server.py", line 233, in handle_reply
protocol.handle_reply(message)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/http_protocol.py", line 262, in handle_reply
raise ValueError(
ValueError: HTTP response has not yet been started but got http.response.body
b'/static/bootstrap4/dist/css/bootstrap.min.css' http.response.start
2020-11-04 12:20:12,540 ERROR Exception in callback AsyncioSelectorReactor.callLater..run() at /home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/twisted/internet/asyncioreactor.py:287
handle: .run() at /home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/twisted/internet/asyncioreactor.py:287>
Traceback (most recent call last):
File "/usr/lib/python3.8/asyncio/events.py", line 81, in _run
self._context.run(self._callback, *self._args)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/twisted/internet/asyncioreactor.py", line 290, in run
f(*args, **kwargs)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/server.py", line 295, in application_checker
protocol.handle_exception(exception)
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/http_protocol.py", line 307, in handle_exception
self.basic_error(500, b"Internal Server Error", "Exception inside application.")
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/http_protocol.py", line 348, in basic_error
self.handle_reply(
File "/home/moh/codess/trade-platoform/.venv/lib/python3.8/site-packages/daphne/http_protocol.py", line 244, in handle_reply
raise ValueError("HTTP response has already been started")
ValueError: HTTP response has already been started
b'/media/img/components_images/WTP%20Product%20Images/TagFa

```
The code

```
# wsgi
import os
from django.core.wsgi import get_wsgi_application
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myapp.settings")
application = get_wsgi_application()
```
```
# asgi.py
import os
import django
from myapp.wsgi import *
from channels.routing import get_default_application

from channels.sessions import SessionMiddlewareStack
from tp_celery.consumers import UpdateOrderStatus
from channels.routing import ProtocolTypeRouter, URLRouter
from django.urls import path
from myapp.routing import websocket_urlpatterns
```

```
application = ProtocolTypeRouter({

"websocket": SessionMiddlewareStack(
URLRouter(websocket_urlpatterns)
),

})
```
```
#
rooting.py
from tp_celery.consumers import UpdateOrderStatus
from django.urls import path

websocket_urlpatterns = [
path("ws/update-order-status/", UpdateOrderStatus),
]
```

```
# consummer.py
from channels.consumer import SyncConsumer

class UpdateOrderStatus(SyncConsumer):

def websocket_connect(self, event):
self.send({
"type": "websocket.accept",
})

def websocket_receive(self, event):
self.send({
"type": "websocket.send",
"text": event["text"],
})

```

What I notice as well by simplifying the page template if I delete the row where we use the static `link href="{% static 'awesome-bootstrap-checkbox/awesome-bootstrap-checkbox.css' %}" rel="stylesheet" />
the page is loading and it's not blocked, and If I add a any source using static it does freeze.

```
{% load i18n sekizai_tags static sass_tags %}

Tradeplatform

``