How to integrate Scalable web chat chatroom with rasa

I am trying to integrate Scalable chatroom with Rasa. I followed the below steps I copiedrasa_utils/ to the root folder I created credentials.yml and added below. What should i pass as input parameters. rasa_utils.bot_server_channel.BotServerInputChannel: # pass Then i started the Rasa core with this

python -m  \
  --core models/current/dialogue  \
  --nlu models/current/nlu  \
  --endpoints endpoints.yml \
  --credentials credentials.yml

I am getting the below error.can you please help what should i add in credentials.yml and also fix the error - - [2019-05-19 20:27:21] “GET /webhooks/chatroom/conversations/aa0df269-daa2-4381-a55a-3e17abc7eaeb/log?nocache=1558277840952 HTTP/1.1” 404 408 0.000000 - - [2019-05-19 20:27:21] “GET /webhooks/chatroom/conversations/95aeef36-7887-45e6-85cf-dd351525ea13/log?nocache=1558277841730 HTTP/1.1” 404 408 0.000000 Exception in thread Thread-1:

Also in the front end , i am getting this error Chatroom.js:1032 GET net::ERR_CONNECTION_REFUSED

Kindly help.What should i give in my credentials.yml