Google Assistant with Rasa - ngrok error

I use rasa run --enable-api -p 5004 and then use ngrok on port 5004, after that I copy the url generated by ngrok with suffix /webhooks/google_home/webhook . The last is run rasa run actions --actions actions and follow the rest of the tutorial from the blog.

But my assistant won’t response when I tested it and saying that “It isn’t responding right now. Try again soon.” . How to solve this?

Screenshot-20190707093507-543x201

Best regard

update : Does this source has an impact to our error?