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后，我使用Django渠道时收到消息得到此异常通道层重装：Django的，异常
2017-07-27 08:34:56,241 - DEBUG - worker - Got message on websocket.receive (reply daphne.response.key)
2017-07-27 08:34:56,242 - DEBUG - runworker - websocket.receive
2017-07-27 08:34:56,242 - DEBUG - worker - Dispatching message on websocket.receive to project.consumers.ws_message
Traceback (most recent call last):
File "/project/manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 355, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/channels/management/commands/runworker.py", line 83, in handle
worker.run()
File "/usr/local/lib/python2.7/dist-packages/channels/worker.py", line 151, in run
consumer_finished.send(sender=self.__class__)
File "/usr/local/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 193, in send
for receiver in self._live_receivers(sender)
File "/usr/local/lib/python2.7/dist-packages/channels/message.py", line 105, in send_and_flush
sender.send(message, immediately=True)
File "/usr/local/lib/python2.7/dist-packages/channels/channel.py", line 88, in send
self.channel_layer.send_group(self.name, content)
File "/usr/local/lib/python2.7/dist-packages/asgi_ipc/core.py", line 130, in send_group
for channel in self.group_channels(group):
File "/usr/local/lib/python2.7/dist-packages/asgi_ipc/core.py", line 137, in group_channels
return self.group_store.flush_expired(group)
File "/usr/local/lib/python2.7/dist-packages/asgi_ipc/store.py", line 188, in flush_expired
for item, expiry in value[name].items()
KeyError: u'None'
2017-07-27 08:34:57,719 - INFO - runworker - Using single-threaded worker.
2017-07-27 08:34:57,719 - INFO - runworker - Running worker against channel layer default (asgi_ipc.core.IPCChannelLayer)
2017-07-27 08:34:57,719 - INFO - worker - Listening on channels http.request, websocket.connect, websocket.disconnect, websocket.receive
ws_message代码：
@channel_session
def ws_message(message):
order_id = int(message.content['text'])
order = Order.objects.get(pk=order_id)
artist_id = message.channel_session["user_id"]
artist = Artist.objects.get(user=User.objects.get(pk=artist_id))
order.artist = artist
Group(str(order.client.id)).send({'bytes': json.dumps({'time': str(order.time),
'name': artist.user.first_name + " " + artist.user.last_name})})
我在做什么错？