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Application error with Heroku deployment

I forked a repo on github and deployed that on heroku. I was able to deploy it and view it.
But, I tried to replace the app.py from the forked repo with my app.py.
Changed few things in requirements.txt to match my versions of packages and froze it through cmd. Ran the app locally. No error. The datasets needed for the app are on the github repo and read in to the Dash app.

I tried deploying it in Heroku. Deployment is successful. No errors in the log too! But I see ‘application error’. I am a beginner to Heroku deployment.

Deployment Successful

Application error on the page.

Build log