Create-react-app: Application error in Heroku "dyno= connect= service= status=503 bytes= protocol=https"

[Ganeshreact14]

My react app got deployed into Heroku and application is not up.. getting the below application error in Heroku

"at=error code=H10 desc="App crashed" method=GET path="/" host=react-cart02.herokuapp.com request_id=5879e078-8169-45e7-865a-74cd8ea1fc2e fwd="223.235.230.237" dyno= connect= service= status=503 bytes= protocol=https"
react-cart02-logs-1586973407896.txt

Github code: https://github.com/Ganeshreact14/react_cart/

[digiguru]

I get this same exact error when updating react-scripts from 3.4.0 to 3.4.1 in my app. The only changes in my code are in package.json (and the automatic changes in package-lock.json)

When I push previously this is the output in heroku.

> {project}@0.1.0 start /app
> react-scripts start

State changed from starting to up
Project is running at http://{ip}/
webpack output is served from
Content not from webpack is served from /app/public
404s will fallback to /

Starting the development server...

Compiled successfully!

You can now view {projectname} in the browser.

Local:            http://localhost:{port}
On Your Network:  http://{ip}:{port}

Note that the development build is not optimized.
To create a production build, use npm run build.

Which is fine. When I go to deploy with [email protected]

Starting the development server...


> {project}@0.1.0 start /app
> react-scripts start

State changed from starting to crashed
Project is running at http://{ip}/
webpack output is served from
Content not from webpack is served from /app/public
404s will fallback to /
Starting the development server...

at=error code=H10 desc="App crashed" method=GET path="/" host={project}.herokuapp.com request_id={id} fwd="{ip}" dyno= connect= service= status=503 bytes= protocol=https

It seems it crashes on start, but I can't see how to debug the start process. Any ideas why this might be happening?

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