Heroku web app deployment error
This is a very generic error and question without providing any code. But the most I can see is that you're missing a favicon.ico. Just make one and add it to your project root.
I'm getting an Application error when running my python heroku app and the logs show:
at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=python-blackjack.herokuapp.com request_id=38f050c2-bc7e-499a-8112-ee7d4b66bf0c fwd="90.205.68.255" dyno= connect= service= status=503 bytes= protocol=https
does anyone know the issue/s 
thanks