KeyError: 'DJANGO_SECRET_KEY'

[smobbl-bobbl]

When I add this buildpack to heroku, I receive following error when pushing the git to heroku:

[root@zubserv utiluruServer]# git push heroku master
Counting objects: 7, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 385 bytes | 0 bytes/s, done.
Total 4 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Python app detected
remote: ! The latest version of Python 3 is python-3.6.5 (you are using python-3.6.3, which is unsupported).
remote: ! We recommend upgrading by specifying the latest version (python-3.6.5).
remote: Learn More: https://devcenter.heroku.com/articles/python-runtimes
remote: -----> Installing requirements with pip
remote:
remote: -----> $ python manage.py collectstatic --noinput
remote: /app/.heroku/python/lib/python3.6/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
remote: """)
remote: 187 static files copied to '/tmp/build_918c6de6c7aaae1c4390cf0a65ae5b06/staticfiles'.
remote:
remote: -----> django-compressor app detected
remote: -----> Running django-compressor
remote: Traceback (most recent call last):
remote: File "manage.py", line 15, in <module>
remote: execute_from_command_line(sys.argv)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
remote: utility.execute()
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 317, in execute
remote: settings.INSTALLED_APPS
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 56, in __getattr__
remote: self._setup(name)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 43, in _setup
remote: self._wrapped = Settings(settings_module)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 106, in __init__
remote: mod = importlib.import_module(self.SETTINGS_MODULE)
remote: File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126, in import_module
remote: return _bootstrap._gcd_import(name[level:], package, level)
remote: File "<frozen importlib._bootstrap>", line 994, in _gcd_import
remote: File "<frozen importlib._bootstrap>", line 971, in _find_and_load
remote: File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
remote: File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
remote: File "<frozen importlib._bootstrap_external>", line 678, in exec_module
remote: File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
remote: File "/tmp/build_918c6de6c7aaae1c4390cf0a65ae5b06/utiluruServer/settings.py", line 34, in <module>
remote: SECRET_KEY = os.environ['DJANGO_SECRET_KEY']
remote: File "/app/.heroku/python/lib/python3.6/os.py", line 669, in __getitem__
remote: raise KeyError(key) from None
remote: KeyError: 'DJANGO_SECRET_KEY'
remote: ! Push rejected, failed to compile django-compressor app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
remote: ! Push rejected to utiluru.

[EO2875]

Yeah, I get the same error.

It's not just the secret key, but all environmental variables.