Git push heroku master fails django

Question

I am trying to deploy a django application on heroku.

Here is my proc file:

web: gunicorn playlist.wsgi --log-file -

Here is my requirments.txt:

dj-database-url==0.4.1
Django==1.9.6
gunicorn==19.5.0
whitenoise==3.0

Here is the error messege on git push heroku master

Counting objects: 191, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (173/173), done.
Writing objects: 100% (191/191), 105.35 KiB | 0 bytes/s, done.
Total 191 (delta 91), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Using set buildpack heroku/python
remote: 
remote:  !     Push rejected, failed to detect set buildpack heroku/python
remote: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote: 
remote: Verifying deploy...
remote: 
remote: !   Push rejected to shielded-fortress-12681.
remote: 
To https://git.heroku.com/shielded-fortress-12681.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/shielded-fortress-12681.git'

EDIT

I have also tried:

heroku buildpacks:set heroku/python

Answer 1

I was putting the Procfile in the wrong place. It should be at the root of your repository.