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Why do you have url(r'^http://nameless-dawn-7713.herokuapp.com/$', 'contact')
in your urls file ? In fact, these URLs should be relative to your application, and you should not update this file before uploading to Heroku (if it works locally, it should work on Heroku without any change to this file).
If you want to connect the contact view to your base URL (http://nameless-dawn-7713.herokuapp.com/), you should use something like:
url(r'^$', 'contact')
Hope this helps !
Source:stackexchange.com