title: Namespace Error on django-social-auth
body: <p>I've added django-social-auth in my django project from the instructions on this page <a href="https://github.com/omab/django-social-auth" rel="noreferrer">https://github.com/omab/django-social-auth</a> but when I accesed /login/google/ I encountered an error:
   NoReverseMatch at /login/google/
  'namespace' is not a registered namespace.</p>
  
  <p>What does it means?</p>