Error SECRET_KEY al empujar el proyecto django a heroku

Estoy tratando de impulsar un proyecto django que funcione bien localmente (con heroku local) a heroku. Yo mi settings.py, tengo un juego SECRET_KEY, creado random por django con startproject.

Tanto en manage.py como en wsgi.py, tengo:

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings") 

Esta es la arborescencia de mi proyecto:

 mysite/ ├── db.sqlite3 ├── lecture │  ├── admin.py │  ├── apps.py │  ├── forms.py │  ├── __init__.py │  ├── media │  ├── migrations │  │  ├── 0001_initial.py │  │  ├── 0002_auto_20161021_0952.py │  │  ├── __init__.py │  │  └── __pycache__ │  │  ├── 0001_initial.cpython-34.pyc │  │  ├── 0002_auto_20161021_0952.cpython-34.pyc │  │  └── __init__.cpython-34.pyc │  ├── models.py │  ├── __pycache__ │  │  ├── admin.cpython-34.pyc │  │  ├── apps.cpython-34.pyc │  │  ├── __init__.cpython-34.pyc │  │  ├── models.cpython-34.pyc │  │  ├── urls.cpython-34.pyc │  │  └── views.cpython-34.pyc │  ├── static │  │  └── lecture │  │  ├── images │  │  │  └── background.gif │  │  └── style.css │  ├── templates │  │  └── lecture │  │  ├── ajouter.html │  │  ├── base_site.html │  │  ├── debug.html │  │  ├── detail.html │  │  ├── detail_oeuvre.html │  │  ├── index.html │  │  ├── index_lectures.html │  │  └── results.html │  ├── tests.py │  ├── urls.py │  └── views.py ├── log │  ├── admin.py │  ├── apps.py │  ├── __init__.py │  ├── media │  ├── migrations │  │  ├── __init__.py │  │  └── __pycache__ │  │  └── __init__.cpython-34.pyc │  ├── models.py │  ├── __pycache__ │  │  ├── admin.cpython-34.pyc │  │  ├── apps.cpython-34.pyc │  │  ├── __init__.cpython-34.pyc │  │  ├── models.cpython-34.pyc │  │  ├── urls.cpython-34.pyc │  │  └── views.cpython-34.pyc │  ├── templates │  │  └── log │  │  └── login_form.html │  ├── tests.py │  ├── urls.py │  └── views.py ├── manage.py ├── mysite │  ├── __init__.py │  ├── __init__.pyc │  ├── middleware.py │  ├── __pycache__ │  │  ├── __init__.cpython-34.pyc │  │  ├── settings.cpython-34.pyc │  │  ├── urls.cpython-34.pyc │  │  └── wsgi.cpython-34.pyc │  ├── settings.py │  ├── settings.pyc │  ├── urls.py │  ├── urls.pyc │  ├── wsgi.py │  └── wsgi.pyc ├── polls │  ├── admin.py │  ├── admin.pyc │  ├── apps.py │  ├── apps.pyc │  ├── __init__.py │  ├── __init__.pyc │  ├── media │  ├── migrations │  │  ├── 0001_initial.py │  │  ├── 0001_initial.pyc │  │  ├── __init__.py │  │  ├── __init__.pyc │  │  └── __pycache__ │  │  ├── 0001_initial.cpython-34.pyc │  │  └── __init__.cpython-34.pyc │  ├── models.py │  ├── models.pyc │  ├── __pycache__ │  │  ├── admin.cpython-34.pyc │  │  ├── apps.cpython-34.pyc │  │  ├── __init__.cpython-34.pyc │  │  ├── models.cpython-34.pyc │  │  ├── tests.cpython-34.pyc │  │  ├── urls.cpython-34.pyc │  │  └── views.cpython-34.pyc │  ├── static │  │  └── polls │  │  ├── images │  │  │  └── background.gif │  │  └── style.css │  ├── templates │  │  └── polls │  │  ├── detail.html │  │  ├── index.html │  │  └── results.html │  ├── tests.py │  ├── urls.py │  ├── urls.pyc │  ├── views.py │  └── views.pyc ├── Procfile ├── requirements.txt ├── templates │  └── admin │  ├── base_site.html │  └── index.html 

Cuando ejecuto git push heroku master , obtengo un error ImproperlyConfigunetworking ; la configuration SECRET_KEY no debe estar vacía :

 Counting objects: 116, done. Delta compression using up to 4 threads. Compressing objects: 100% (105/105), done. Writing objects: 100% (116/116), 1.38 MiB | 46.00 KiB/s, done. Total 116 (delta 13), reused 0 (delta 0) remote: Compressing source files... done. remote: Building source: remote: remote: -----> Python app detected remote: -----> Installing python-2.7.12 remote: $ pip install -r requirements.txt remote: Collecting dj-database-url==0.4.1 (from -r requirements.txt (line 1)) remote: Downloading dj-database-url-0.4.1.tar.gz remote: Collecting Django==1.10.1 (from -r requirements.txt (line 2)) remote: Downloading Django-1.10.1-py2.py3-none-any.whl (6.8MB) remote: Collecting django-extensions==1.7.4 (from -r requirements.txt (line 3)) remote: Downloading django_extensions-1.7.4-py2.py3-none-any.whl (200kB) remote: Collecting gunicorn==19.6.0 (from -r requirements.txt (line 4)) remote: Downloading gunicorn-19.6.0-py2.py3-none-any.whl (114kB) remote: Collecting six==1.10.0 (from -r requirements.txt (line 5)) remote: Downloading six-1.10.0-py2.py3-none-any.whl remote: Collecting whitenoise==3.2.2 (from -r requirements.txt (line 6)) remote: Downloading whitenoise-3.2.2-py2.py3-none-any.whl remote: Installing collected packages: dj-database-url, Django, six, django-extensions, gunicorn, whitenoise remote: Running setup.py install for dj-database-url: started remote: Running setup.py install for dj-database-url: finished with status 'done' remote: Successfully installed Django-1.10.1 dj-database-url-0.4.1 django-extensions-1.7.4 gunicorn-19.6.0 six-1.10.0 whitenoise-3.2.2 remote: remote: $ python manage.py collectstatic --noinput remote: Traceback (most recent call last): remote: File "manage.py", line 22, in <module> remote: execute_from_command_line(sys.argv) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line remote: utility.execute() remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/core/management/__init__.py", line 359, in execute remote: self.fetch_command(subcommand).run_from_argv(self.argv) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/core/management/__init__.py", line 196, in fetch_command remote: settings.INSTALLED_APPS remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 53, in __getattr__ remote: self._setup(name) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 41, in _setup remote: self._wrapped = Settings(settings_module) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 97, in __init__ remote: mod = importlib.import_module(self.SETTINGS_MODULE) remote: File "/app/.heroku/python/lib/python2.7/importlib/__init__.py", line 37, in import_module remote: __import__(name) remote: File "/app/mysite/urls.py", line 20, in <module> remote: url(r'^polls/', include('polls.urls')), remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/urls/__init__.py", line 50, in include remote: urlconf_module = import_module(urlconf_module) remote: File "/app/.heroku/python/lib/python2.7/importlib/__init__.py", line 37, in import_module remote: __import__(name) remote: File "/app/polls/urls.py", line 3, in <module> remote: from . import views remote: File "/app/polls/views.py", line 5, in <module> remote: from .models import Choice, Question remote: File "/app/polls/models.py", line 9, in <module> remote: class Question(models.Model): remote: File "/app/polls/models.py", line 10, in Question remote: question_text = models.CharField(max_length = 200) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1043, in __init__ remote: super(CharField, self).__init__(*args, **kwargs) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 166, in __init__ remote: self.db_tablespace = db_tablespace or settings.DEFAULT_INDEX_TABLESPACE remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 53, in __getattr__ remote: self._setup(name) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 41, in _setup remote: self._wrapped = Settings(settings_module) remote: File "/app/.heroku/python/lib/python2.7/site-packages/django/conf/__init__.py", line 116, in __init__ remote: raise ImproperlyConfigunetworking("The SECRET_KEY setting must not be empty.") remote: django.core.exceptions.ImproperlyConfigunetworking: The SECRET_KEY setting must not be empty. remote: remote: ! Error while running '$ python manage.py collectstatic --noinput'. remote: See traceback above for details. remote: remote: You may need to update application code to resolve this error. remote: Or, you can disable collectstatic for this application: remote: remote: $ heroku config:set DISABLE_COLLECTSTATIC=1 remote: remote: https://devcenter.heroku.com/articles/django-assets remote: ! Push rejected, failed to compile Python app. remote: remote: ! Push failed remote: Verifying deploy.... remote: remote: ! Push rejected to lecturapp. remote: To https://git.heroku.com/lecturapp.git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to 'https://git.heroku.com/lecturapp.git' 

Simplemente no puedo entender el problema. Cuando lo busco, todo lo que encuentro son preguntas de personas que no establecieron SECRET_KEY, pero el mío está configurado en settings.py.

¡Gracias de antemano por tu ayuda!

EDITAR: Aquí está mi file de logging:

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

Y mi wsgi.py:

 """ WSGI config for mysite project. It exposes the WSGI callable as a module-level variable named ``application``. For more information on this file, see https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/ """ import os from django.core.wsgi import get_wsgi_application from whitenoise.django import DjangoWhiteNoise application = get_wsgi_application() application = DjangoWhiteNoise(application) os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")