title: Importing classes from app in django
body: <blockquote>
    <p>django.core.exceptions.ImproperlyConfigured: Requested setting
    DEFAULT_INDEX_TABLESPACE, but settings are not configured. You must
    either define the environment variable DJANGO_SETTINGS_MODULE or call
    settings.configure() before accessing settings.</p>
  </blockquote>
  
  <p>Can anyone please help me how to solve this problem ?</p>