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

• Login to your Heroku dashboard and open your projects.
• Go to Settings.
• Delete heroku/python from the list of buildpacks
• Then click Add buildpack → Choose "Python" → Save Changes.
• Activate your environment in your code.
• Run heroku ps:scale web=1.

And you're done!