Django-grappelli admin: No reverse match error

I encountered the same behavior with Django 1.5 and Grappelli 2.4.4.

To fix the problem I had to add

url(r'^grappelli/', include('grappelli.urls')),

to urlpatterns.

I faced with this problem today, when I tried to delete data in admin.Reverse for 'app_list' with arguments '()' and keyword arguments '{'app_label': ''}' not found.

I have put the url(r'^grappelli/', include('grappelli.urls')) in urls.py

The solution is pretty strange: just update the grappelli to the latest version. (I updated it from 2.5.6 to 2.6.3)

Do you still have 'grappelli.urls' included in your URLconf? That the only reason I see that would cause this error. You can try using python manage.py shell:

from django.core.urlresolvers import reverse
print reverse('grp_related_lookup')

If this line returns the correct URL, you shouldn't get a NoReverseMatch in your template.

The quotes around grp_related_lookup shouldn't be a concern. The {% url %} tag accepts both quoted and unquoted strings as first argument, so django normalizes it to quoted strings. This behaviour is going to change in the future: you'll be able to pass template variables to {% url %} using unquoted strings. {% url foo %} and {% url "foo" %} won't give the same result, see the 1.3 release notes for details about this.