No webhook handlers configured

[ayyoub-]

Hii,

I build my app using Bottr and it works fine on heroku, But when i try to connect it with my Facebook Page & App i cannot verify and save webhooks i got this error.

{"error":"No webhook handlers configured"}

The URL couldn't be validated. Callback verification failed with the following errors: HTTP Status Code = 403; HTTP Message = Forbidden

my heruko app : https://nameless-falls-33513.herokuapp.com