title: DoesNotExist at /admin/login/ Site matching query does not exist
body: <p><strong>at local when i accessed localhost:8000/admin, it worked....!!! but when i access <a href="https://realmento.herokuapp.com/admin/login/?next=/admin/" rel="nofollow noreferrer">https://realmento.herokuapp.com/admin/login/?next=/admin/</a> , i get message DoesNotExist at /admin/login/
  Site matching query does not exist. i have deployed my project to heroku...
  this is my setting.py :</strong></p>
  
  <pre><code># Build paths inside the project like this: os.path.join(BASE_DIR, ...)
  import os
  
  
  location = lambda x: os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', x)
  BASE_DIR = os.path.dirname(os.path.dirname(__file__))
  STATIC_URL = '/static/'
  STATIC_ROOT = 'staticfiles'
  
  STATICFILES_DIRS = (
      os.path.join(BASE_DIR, 'static'),
  )
  
  
  # Quick-start development settings - unsuitable for production
  # See https://docs.djangoproject.com/en/1.7/howto/deployment/checklist/
  
  
  
  # SECURITY WARNING: don't run with debug turned on in production!
  DEBUG = True
  
  TEMPLATE_DEBUG = True
  
  ALLOWED_HOSTS = ['*']
  MEDIA_URL = '/media/'
  MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
  
  # Application definition
  
  INSTALLED_APPS = (
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'django.contrib.sites',
      'index',
      'category',
      'products',
      'allauth',
      'allauth.account',
      'allauth.socialaccount',
      # ... include the providers you want to enable:
      'allauth.socialaccount.providers.bitly',
      'allauth.socialaccount.providers.dropbox',
      'allauth.socialaccount.providers.github',
      'allauth.socialaccount.providers.google',
      'allauth.socialaccount.providers.facebook',
  )
  
  MIDDLEWARE_CLASSES = (
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.middleware.common.CommonMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
      'django.contrib.auth.middleware.AuthenticationMiddleware',
      'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
      'django.contrib.messages.middleware.MessageMiddleware',
      'django.middleware.clickjacking.XFrameOptionsMiddleware',
      'solid_i18n.middleware.SolidLocaleMiddleware', 
  )
  SITE_ID = 1
  SITE_ID = 2
  AUTHENTICATION_BACKENDS = (
      "django.contrib.auth.backends.ModelBackend",
      "allauth.account.auth_backends.AuthenticationBackend",
  )
  
  TEMPLATE_CONTEXT_PROCESSORS = (
  
      "django.core.context_processors.request",
      "allauth.account.context_processors.account",
      "allauth.socialaccount.context_processors.socialaccount",
      "django.contrib.auth.context_processors.auth",
      "django.core.context_processors.i18n",
      'realmento.context_processors.solid_i18n',
  
  
  )
  
   # default language, it will be used, if django can't recognize user's language
  LANGUAGE_CODE = 'en'
  
  # supported languages
  LANGUAGES = (
      ('en', 'English'),
      ('ko', 'Korean'),
  
  )
  USE_I18N = True
  
  LOCALE_PATHS = (
      location('locale'),
  )
  CACHES = {
      'default': {
          'BACKEND':'django.core.cache.backends.memcached.MemcachedCache',
          'LOCATION':'127.0.0.1:8000',
      }
  }
  
  ###############################################################
  TEMPLATE_LOADERS = (
      'django.template.loaders.filesystem.Loader',
      'django.template.loaders.app_directories.Loader',
  #     'django.template.loaders.eggs.Loader',
  )
  TEMPLATE_DIRS = (
  os.path.join(BASE_DIR,'templates'), os.path.join(BASE_DIR,'templates', 'allauth'))
  #################################################################
  ROOT_URLCONF = 'realmento.urls'
  
  WSGI_APPLICATION = 'realmento.wsgi.application'
  
  # Database
  # https://docs.djangoproject.com/en/1.7/ref/settings/#databases
  
  TIME_ZONE = 'UTC'
  
  USE_L10N = True
  
  USE_TZ = True
  
  ADMINS = (('HOANGTHINH', 'rongbay054@gmail.com'), )
  EMAIL_SUBJECT_PREFIX = "[Translation] "
  EMAIL_HOST = 'smtp.gmail.com'
  EMAIL_HOST_USER = 'hoangthinh2641995@gmail.com'
  EMAIL_HOST_PASSWORD = '*************'
  EMAIL_PORT = 587
  EMAIL_USE_TLS = True
  EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
  # Static files (CSS, JavaScript, Images)
  # https://docs.djangoproject.com/en/1.7/howto/static-files/
  
  LOGIN_REDIRECT_URL = '/realmento/intro'
  LOGOUT_URL = "/accounts/login/"
  SOLID_I18N_USE_REDIRECTS = False
  SOLID_I18N_HANDLE_DEFAULT_PREFIX = False
  SOLID_I18N_DEFAULT_PREFIX_REDIRECT = False
  
  # Parse database configuration from $DATABASE_URL
  import dj_database_url
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.postgresql_psycopg2',
          'NAME': 'realmento',
          'USER': 'postgres',
          'PASSWORD': 'root',
          'HOST': 'localhost',
          'PORT': '5432',
      }
  }
  # DATABASE_URL=postgres:///postgres:root@localhost/realmento
  
  DATABASES['default'] =  dj_database_url.config(default = 'postgres://postgres:root@localhost/realmento')
  # Honor the 'X-Forwarded-Proto' header for request.is_secure()
  SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
  </code></pre>
  
  <p>So what's the problem? Thanks a lot for your help!</p>