Heroku flask application error No web processes running

I'm a newbie, trying to get a flask chatterbox application Github to work on heroku. I can get it running just fine, locally, but it deploys and nothing happens, I just get application error.

This is the log I get with heroku logs --tail. I think it's something to do with this Procfile I have no clue about.

2021-05-30T23:56:46.955267+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/favicon.ico" host=murmuring-refuge-89355.herokuapp.com request_id=d9837176-ecfd-4739-bb7d-9efe086feb58 fwd="177.208.24.201" dyno= connect= service= status=503 bytes= protocol=https

source https://stackoverflow.com/questions/67766686/heroku-flask-application-error-no-web-processes-running

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