Twillo Callback Channel Error

Rasa Open Source
1

Rasa core == 11.2

The twillo callback channel is unable to parse my credentials.yml file and get the account sid;

File "/Users/ahson/Library/Python/2.7/lib/python/site-packages/rasa_core/run.py", line 177, in _create_single_channel
    credentials.get("account_sid"),
AttributeError: 'NoneType' object has no attribute 'get'

When I run this following command:

python -m rasa_core.run -d models/dialogue -u models/current/nlu --endpoints endpoints.yml --connector "twilio" --port 5002 --credentials credentials.yml --enable_api

credentials.yml;

twillio:
  account_sid: "xxxxxxxxxxx"
  auth_token: "xxxxxxxxxxx"
  twilio_number: "+xxxxxx"
2

Resolved, there was a problem with the run.py parsing credentials_file.
You need to edit the _create_external_channels method