Error Heroku , desc="No web processes running" method=GET path="/favicon.ico"?

2023-01-24T12:48:09.490016+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=pizza.herokuapp.com request_id=cb7658a6-061a-4ae1-8e3c-f07247d956fc fwd="78.141.167.114" dyno= connect= service= status=5
03 bytes= protocol=https
2023-01-24T12:48:10.638376+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=pizza.herokuapp.com request_id=0a379b0d-021f-4dc8-967b-b897ff678596 fwd="78.141.167.114" dyno= connect= servic
e= status=503 bytes= protocol=https

I don't understand this error, what it means by the /favicon.ico being unable to have the get method?

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