Exception occurred while handling uri

Hi,

I am running RasaX in production , when I go in a hit train , I have this error log on RasaX docker container

Exception occurred while handling uri: 'http://xxx.xxx.xxx.239/api/conversations/d796cffd51a64268a38ae84b001453b5/messages?environment=production'
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 917, in handle_request
    response = await response
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/decorators.py", line 176, in decorated_function
    return await await_and_return_response(args, kwargs, request)
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/decorators.py", line 106, in await_and_return_response
    response = await response
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/blueprints/stack.py", line 357, in send_message
    return await chat_to_bot(request, conversation_id)
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/decorators.py", line 176, in decorated_function
    return await await_and_return_response(args, kwargs, request)
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/decorators.py", line 106, in await_and_return_response
    response = await response
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/decorators.py", line 196, in decorated_function
    return await f(request, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/rasax/community/api/blueprints/stack.py", line 733, in chat_to_bot
    message_object, token=request.headers.get("Authorization")
  File "/usr/local/lib/python3.6/site-packages/rasax/community/services/stack_service.py", line 172, in send_message
    subpath=url, method="post", json=message, headers={"Authorization": token}
  File "/usr/local/lib/python3.6/site-packages/rasa/utils/endpoints.py", line 144, in request
    **kwargs
  File "/usr/local/lib/python3.6/site-packages/aiohttp/client.py", line 1005, in __aenter__
    self._resp = await self._coro
  File "/usr/local/lib/python3.6/site-packages/aiohttp/client.py", line 497, in _request
    await resp.start(conn)
  File "/usr/local/lib/python3.6/site-packages/aiohttp/client_reqrep.py", line 857, in start
    self._continue = None
  File "/usr/local/lib/python3.6/site-packages/aiohttp/helpers.py", line 585, in __exit__
    raise asyncio.TimeoutError from None
concurrent.futures._base.TimeoutError
Exception occurred while handling uri: 'http://xxx.xxx.xxx.239/api/projects/default/models/jobs'
NoneType: None

Exception occurred while handling uri: 'http://xxx.xxx.xxx.239/api/projects/default/models/jobs'
NoneType: None

I have 36000 training examples , 49 stories

the configuration is the default settings as follows

pipeline: supervised_embeddings
language: en
policies:
- name: MemoizationPolicy
- name: KerasPolicy
- name: MappingPolicy

Server Configuration

OS: ubuntu18.04
RAM: 16 GB