[Answered ]-Reverse for 'detail' with arguments '('',)' and keyword arguments '{}' not found

Correct me if I’m wrong, but it looks like you’re trying to feed the 'signature:details' URL a string, but in your urls.py it looks like you only accept digits.

Try changing

url(r'^(?P<signature_identifier>\d+)/$', views.DetailView.as_view(), name='detail'),


to:

url(r'^(?P<signature_identifier>\w+)/$', views.DetailView.as_view(), name='detail'),