Without adding this, got an error.

[Hadisur Rahman]

== Given that :

from django.urls import path
from . import views
app_name = 'polls'
urlpatterns = [

path(, views.index, name='index'),
path('<int:question_id>/', views.detail, name='detail'),
path('<int:question_id>/results/', views.results, name='results'),
path('<int:question_id>/vote/', views.vote, name='vote'),

]

== We need to edit and add like this (see below):

from mysite import urls
urls.app_name='polls'

[Mariusz Felisiak]

The current form works for me. Try to use one of support channels.