Deploy Django to Heroku - Push rejected

I am trying deploy my Django application to heroku and I get an error when I perform git push heroku master command

My structure directory is the following

And the content of requirements/production.txt is:

-r base.txt  gunicorn==19.4.5  dj-database-url==0.4.0

requirements/base.txt have this content:

Django==1.9.2
djangorestframework==3.3.2
Pillow==3.1.1
psycopg2==2.6.1
Markdown==2.6.5
django-filter==0.12.0
django-storages-redux==1.3
django-suit==0.2.16
django-boto==0.3.9
django-multiselectfield==0.1.3

The process that I am perform for deploy to my app to heroku is the following and the error is push rejected:

(uleague) ➜  pickapp git:(master) ✗ heroku create fuupbol --buildpack heroku/python  Creating fuupbol... done, stack is cedar-14  Setting buildpack to heroku/python... done  https://fuupbol.herokuapp.com/ | https://git.heroku.com/fuupbol.git  (uleague) ➜  pickapp git:(master) ✗ git remote -v  heroku	https://git.heroku.com/fuupbol.git (fetch)  heroku	https://git.heroku.com/fuupbol.git (push)  origin	https://bgarcial@bitbucket.org/bgarcial/pickapp.git (fetch)  origin	https://bgarcial@bitbucket.org/bgarcial/pickapp.git (push)  (uleague) ➜  pickapp git:(master) ✗ git push heroku master  Counting objects: 195, done.  Delta compression using up to 8 threads.  Compressing objects: 100% (92/92), done.  Writing objects: 100% (195/195), 516.34 KiB | 0 bytes/s, done.  Total 195 (delta 93), reused 195 (delta 93)  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 fuupbol.  remote:   To https://git.heroku.com/fuupbol.git   ! [remote rejected] master -> master (pre-receive hook declined)  error: failed to push some refs to 'https://git.heroku.com/fuupbol.git'  (uleague) ➜  pickapp git:(master) ✗

I follow the getting started tutorial for deploy in heroku web page and in their samples, the requirements.txt and the settings.py were as a isolated files in the root project and not nested under folders as a settings/ folder or a requirements /folder

This have related for my error of push rejected ?

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