@Fares what is your front end? and which tutorial you following if you can share some link?
I’m following this tuto Build an AI voice assistant with Rasa Open Source and Mozilla tools | Rasa
@Fares I got you right 
I will see much now tomorrow me exhausted for the day, may be Chris add some more, when he online. we will together solve this error
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Ok, thanks a lot for both of you
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Any solution yet? I’m stuck on the same type of error (but for a custom telegram implementation) where it just says “RasaException: Failed to find input channel class for 'custom.telegram2”