H14 error in heroku - "no web processes running"

The issue here is that you're not running any web dynos. You can tell Heroku to do this via:

$ heroku ps:scale web=1

This will force Heroku to spin up a web dyno, thereby executing your gunicorn command.

After 3 hours of debugging, I've figured out why my app was causing this error:

1. My Procfile was incorrectly cased
2. gunicorn wasn't installed in my venv

IMO, this error should be raised on Heroku's end. As a beginner, this sort of error is difficult to trace.

More info on dyno configuration – more on initializing your heroku app.

Before this command:

heroku ps:scale web=1

I had to remove and add buildpacks again and empty commit it and redeploy it to heroku.

heroku buildpacks:clear
heroku buildpacks:add --index heroku/python

I was having an issue here too. My problem was that my Procfile was "Procfile.txt" . What solved my issue was to remove the file extension from Procfile, then recommit and push stuff to heroku