"Application Error" on Heroku after deploying the app ? Please, help me to solve this

1

2020-04-29T01:43:29.343738+00:00 app[web.1]: npm ERR! Exit status 1
2020-04-29T01:43:29.343950+00:00 app[web.1]: npm ERR!
2020-04-29T01:43:29.344091+00:00 app[web.1]: npm ERR! Failed at the chat-app@1.0.0 start script.
2020-04-29T01:43:29.344248+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2020-04-29T01:43:29.531991+00:00 app[web.1]:
2020-04-29T01:43:29.532172+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2020-04-29T01:43:29.532275+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2020-04-29T01_43_29_345Z-debug.log
2020-04-29T01:43:29.599707+00:00 heroku[web.1]: State changed from starting to crashed
2020-04-29T05:35:52.942744+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/" host=chatapp-byvaibhav.herokuapp.com request_id=4b7995bd-a135-4f27-9e27-ab8a24477306 fwd=“132.154.23.44” dyno= connect= service= status=503 bytes= protocol=https
2020-04-29T05:35:54.075802+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/favicon.ico" host=chatapp-byvaibhav.herokuapp.com request_id=230f4e72-0736-4b18-9e17-de3065a849f0 fwd=“132.154.23.44” dyno= connect= service= status=503 bytes= protocol=https

2

Do you have the port set to process.env.PORT?