django-cms, template edit is not working
===

i am getting this error when i try to write something into ``placeholder`` directly in template. it cannot find the clue, i have done the steps exactly like shown in the docs

    ValueError at /admin/cms/page/3/edit-plugin/4
    The view home.views.index didn't return an HttpResponse object.

here is my urls.py: 

http://pastebin.com/zZX1MkMh

am i missing something else? 

Thanks