title: AttributeError: 'Settings' object has no attribute 'ROOT_URLCONF' on Heroku
body: <p>I am getting this error when I deploy to Heroku:</p>
  
  <pre><code>2014-05-07T11:50:06.927955+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=staging.mysite.com request_id=eead056c-f89d-4fcd-b282-71a023631a71 fwd="80.237.234.148" dyno=web.1 connect=1ms service=4ms status=500 bytes=238
  2014-05-07T11:50:06.925723+00:00 app[web.1]: 2014-05-07 06:50:06 [7] [ERROR] Error handling request
  2014-05-07T11:50:06.925732+00:00 app[web.1]: Traceback (most recent call last):
  2014-05-07T11:50:06.925746+00:00 app[web.1]:     urlconf = settings.ROOT_URLCONF
  2014-05-07T11:50:06.925735+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/gunicorn/workers/sync.py", line 126, in handle_request
  2014-05-07T11:50:06.925738+00:00 app[web.1]:     respiter = self.wsgi(environ, resp.start_response)
  2014-05-07T11:50:06.925740+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 241, in __call__
  2014-05-07T11:50:06.925742+00:00 app[web.1]:     response = self.get_response(request)
  2014-05-07T11:50:06.925744+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py", line 82, in get_response
  2014-05-07T11:50:06.925751+00:00 app[web.1]:     return func(self._wrapped, *args)
  2014-05-07T11:50:06.925749+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/utils/functional.py", line 185, in inner
  2014-05-07T11:50:06.925753+00:00 app[web.1]: AttributeError: 'Settings' object has no attribute 'ROOT_URLCONF'
  </code></pre>
  
  <p>Locally it works fine, and in the remote bash shell, it seems that django can access ROOT_URLCONF, as I am running:</p>
  
  <pre><code>~ $ python manage.py shell
  Python 2.7.4 (default, Apr 6 2013, 22:14:13)
  In [2]: from django.conf import settings
  In [3]: settings.ROOT_URLCONF
  Out[3]: 'urls'
  </code></pre>
  
  <p>The settings file therefore seems accessible to manage.py and includes the correct ROOT_URLCONF variable.</p>
  
  <p>I have tried very many configurations with no luck. Any ideas?</p>
  
  <p>Here are my current manage.py and settings configurations (env variable ENV is set to staging here):</p>
  
  <pre><code># manage.py
  
  #!/usr/bin/env python
  import os
  import sys
  
  environment = os.environ['ENV']
  
  if __name__ == "__main__":
      os.environ.setdefault("DJANGO_SETTINGS_MODULE", 'main.settings.' + environment)
  
      from django.core.management import execute_from_command_line
      execute_from_command_line(sys.argv)
  </code></pre>
  
  <p>settings/ folder contains an empty <em>__init__.py</em> and:</p>
  
  <pre><code># staging.py
  
  from .base import *
  
  MIDDLEWARE_CLASSES = (
      'django.middleware.common.CommonMiddleware',
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.contrib.auth.middleware.AuthenticationMiddleware',
      'django.contrib.messages.middleware.MessageMiddleware',
      'django_facebook.auth_backends.FacebookBackend',
      'fandjango.middleware.FacebookMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
      # 'debug_toolbar.middleware.DebugToolbarMiddleware',
      # Uncomment the next line for simple clickjacking protection:
      # 'django.middleware.clickjacking.XFrameOptionsMiddleware',
  )
  
  INSTALLED_APPS = (
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.sites',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'south',
      'crewcal',
      'django_extensions',
      'registration',
      'django_facebook',
      'fandjango',
      'django.contrib.humanize',
      'storages',
      'datetimewidget',
      'postman',
      'notification',
      # 'raven.contrib.django.raven_compat',
      # Uncomment the next line to enable the admin:
      'django.contrib.admin',
      # Uncomment the next line to enable admin documentation:
      # 'django.contrib.admindocs',
  )
  
  
  
  # base.py
  
  ENV = 'DEVELOPMENT'
  
  import os
  import sys
  
  MAIN_APP_DIR = os.path.dirname(__file__)
  PROJECT_NAME = MAIN_APP_DIR.split('/')[-1]
  project_root = lambda f: os.path.abspath(os.path.join(MAIN_APP_DIR, '../../', f))
  
  
  PROJECT_ROOT = os.path.abspath(os.path.dirname(__file__))
  PROJECT_DIR = os.path.join(PROJECT_ROOT,'../../crewcal')
  
  WEB_ROOT = project_root('webroot')
  
  
  sys.path.insert(0, os.path.join(MAIN_APP_DIR, '../'))
  sys.path.insert(0, MAIN_APP_DIR)
  
  dev = 'DEVELOPMENT'
  
  DEBUG = (ENV is dev)
  TEMPLATE_DEBUG = DEBUG
  
  TESTING = 'test' in sys.argv
  
  ADMINS = (
      ('Me', 'info@me.org.uk'),
  )
  
  MANAGERS = ADMINS
  
  DATABASE_CONFIGS = {
      'DEVELOPMENT': {
          'default': {
              'ENGINE': 'django.db.backends.postgresql_psycopg2', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'.
              'NAME': 'ssc',                      # Or path to database file if using sqlite3.
              'USER': 'postgres',                      # Not used with sqlite3.
              'PASSWORD': 'xxx',                  # Not used with sqlite3.
              'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
              'PORT': '',                      # Set to empty string for default. Not used with sqlite3.
          }
      },
  }
  
  DATABASES = DATABASE_CONFIGS[ENV]
  
  SITE_ID = 1
  
  # If you set this to False, Django will make some optimizations so as not
  # to load the internationalization machinery.
  USE_I18N = False
  
  # If you set this to False, Django will not format dates, numbers and
  # calendars according to the current locale.
  USE_L10N = True
  
  gettext = lambda s: s
  LANGUAGES = (('en', gettext('English')),)
  
  MEDIA_ROOT = os.path.join(WEB_ROOT, 'media')
  MEDIA_URL = '/media/'
  
  STATIC_ROOT = os.path.join(PROJECT_DIR, 'static')
  
  AWS_ACCESS_KEY_ID = 'SECRET'
  AWS_SECRET_ACCESS_KEY = 'SECRET'
  AWS_STORAGE_BUCKET_NAME = 'vvv'
  
  # URL prefix for static files.
  # Example: "http://media.lawrence.com/static/"
  try:
      if os.environ['ENV'] == 'staging' or 'production':
          STATIC_URL = 'https://s3-eu-west-1.amazonaws.com/vvv/'
  except:
      STATIC_URL = '../mysite/static/'
  
  # Additional locations of static files
  STATICFILES_DIRS = (
      # Put strings here, like "/home/html/static" or "C:/www/django/static".
      # Always use forward slashes, even on Windows.
      # Don't forget to use absolute paths, not relative paths.
  )
  
  # List of finder classes that know how to find static files in
  # various locations.
  STATICFILES_FINDERS = (
      'django.contrib.staticfiles.finders.FileSystemFinder',
      'django.contrib.staticfiles.finders.AppDirectoriesFinder',
  #    'django.contrib.staticfiles.finders.DefaultStorageFinder',
  )
  
  # Make this unique, and don't share it with anybody.
  SECRET_KEY = os.environ['SECRET_KEY']
  
  # List of callables that know how to import templates from various sources.
  TEMPLATE_LOADERS = (
      'django.template.loaders.filesystem.Loader',
      'django.template.loaders.app_directories.Loader',
  #     'django.template.loaders.eggs.Loader',
  )
  
  try:
      if os.environ['ENV'] == 'staging' or 'production':
          EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
  except:
      EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
  
  EMAIL_FILE_PATH = (
      #os.path.join(SITE_ROOT, '/app-email-messages') # change this to a proper location)
  )
  ACCOUNT_ACTIVATION_DAYS = 7
  EMAIL_HOST = 'smtp.gmail.com'
  EMAIL_HOST_USER = 'info@me.org.uk'
  EMAIL_HOST_PASSWORD = os.environ['EMAIL_HOST_PASSWORD']
  EMAIL_PORT = 587
  EMAIL_USE_TLS = True
  
  POSTMAN_AUTO_MODERATE_AS = True
  
  ROOT_URLCONF = 'main.urls'
  
  # Python dotted path to the WSGI application used by Django's runserver.
  WSGI_APPLICATION = 'wsgi.application'
  
  
  PROJECT_PATH = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
  
  TEMPLATE_DIRS = (
      os.path.join(PROJECT_PATH, 'templates/'),
      # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
      # Always use forward slashes, even on Windows.
      # Don't forget to use absolute paths, not relative paths.
  )
  
  STATICFILES_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
  
  FACEBOOK_APP_ID = 'app-id'
  FACEBOOK_APP_SECRET = os.environ['FACEBOOK_APP_SECRET']
  
  # fandjango settings
  FACEBOOK_APPLICATION_ID = 'app-id'
  FACEBOOK_APPLICATION_SECRET_KEY = os.environ['FACEBOOK_APP_SECRET']
  FACEBOOK_APPLICATION_NAMESPACE = 'me'
  
  try:
      if os.environ['DOMAIN'] == 'crew':
          DOMAIN = 'crew'
          EVENT_PUB_COMMITTED_CRITICAL_MASS = 3
      elif os.environ['DOMAIN'] == 'staging':
          DOMAIN = 'staging'
          EVENT_PUB_COMMITTED_CRITICAL_MASS = 2
  except:
      DOMAIN = 'crew'
      EVENT_PUB_COMMITTED_CRITICAL_MASS = 3
  
  
  try:
      if os.environ['ENV'] == 'staging':
          MAX_PROPOSED_EVENTS = 3
  except:
      MAX_PROPOSED_EVENTS = 300
  
  POSTMAN_DISALLOW_ANONYMOUS = True
  POSTMAN_AUTO_MODERATE_AS = True
  
  
  INTERNAL_IPS = ('127.0.0.1',)
  
  LOGIN_URL = '/login'
  LOGOUT_URL = '/logout'
  LOGIN_REDIRECT_URL = "/user"
  
  AUTH_PROFILE_MODULE = 'me.UserProfile'
  AUTHENTICATION_BACKENDS = (
      'crewcal.backends.EmailOrUsernameModelBackend',
      'django.contrib.auth.backends.ModelBackend',
      'django_facebook.auth_backends.FacebookBackend',
      'insensitive.backends.CaseInsensitiveModelBackend'
  )
  
  # A sample logging configuration. The only tangible logging
  # performed by this configuration is to send an email to
  # the site admins on every HTTP 500 error when DEBUG=False.
  # See http://docs.djangoproject.com/en/dev/topics/logging for
  # more details on how to customize your logging configuration.
  LOGGING = {
      'version': 1,
      'disable_existing_loggers': False,
      'filters': {
          'require_debug_false': {
              '()': 'django.utils.log.RequireDebugFalse'
          }
      },
      'handlers': {
          'mail_admins': {
              'level': 'ERROR',
              'filters': ['require_debug_false'],
              'class': 'django.utils.log.AdminEmailHandler'
          }
      },
      'loggers': {
          'django.request': {
              'handlers': ['mail_admins'],
              'level': 'ERROR',
              'propagate': True,
          },
      }
  }
  
  TEMPLATE_CONTEXT_PROCESSORS = (
      "django.contrib.auth.context_processors.auth",
      "django.core.context_processors.debug",
      "django.core.context_processors.i18n",
      "django.core.context_processors.media",
      "django.core.context_processors.static",
      "django.core.context_processors.request",
      "django.core.context_processors.tz",
      "django.contrib.messages.context_processors.messages",
      "django_facebook.context_processors.facebook"
  )
  
  
  try:
      if os.environ['ENV'] == 'production':
          DEBUG = False
          ALLOWED_HOSTS = ['me.org.uk',]
          # Parse database configuration from $DATABASE_URL
          import dj_database_url
          DATABASES['default'] =  dj_database_url.config()
  
          # Honor the 'X-Forwarded-Proto' header for request.is_secure()
          SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
      if os.environ['ENV'] == 'staging':
          DEBUG = False
          ALLOWED_HOSTS = ['me.org.uk',]
          # Parse database configuration from $DATABASE_URL
          import dj_database_url
          DATABASES['default'] =  dj_database_url.config()
  
          # Honor the 'X-Forwarded-Proto' header for request.is_secure()
          SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
  except:
      pass
  </code></pre>