H14 error in heroku - “no web processes running”

Question

error H14 happen while deploying to heroku this is my procfile:

web: gunicorn -w 4 -b 0.0.0.0:$PORT -k gevent main:app

log on heroku:

Answer 1

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

Pretty basic errors not to have caught on Heroku's end, pretty obnoxious of them not to include in some error readout.

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