Help me resolve my heroku app error

1

my app is basedon node JS . and my herkou logs --tail are:

2020-04-10T17:23:33.926601+00:00 heroku[router]: at=error code=H20 desc=“App boot timeout” method=GET path="/" host=fast-harbor-36606.herokuapp.com request_id=7ea5518e-8445-47d6-9b49-15969cdf755b fwd=“49.35.115.206” dyno= connect= service= status=503 bytes= protocol=https
2020-04-10T17:23:33.799980+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/favicon.ico" host=fast-harbor-36606.herokuapp.com request_id=f62b3352-e931-4941-927d-2a68453d515d fwd=“49.35.115.206” dyno= connect= service= status=503 bytes= protocol=https

please help me resolve them

2

I think it has to do with the router.

See if you can find a thread that gives some answers. I can’t remember off the top of my head what is needed and I think there is more than one solution.
http://forum.freecodecamp.org/search?q=heroku%20router
https://www.google.com/search?q=heroku+react+router