Django. The current URL, , didn't match any of these - Python

Формулировка задачи:

Using the URLconf defined in MySite.urls, Django tried these URL patterns, in this order: ^admin/ ^polls/ The current URL, , didn't match any of these. Код MySite/urls.py

from django.conf.urls import include, url
from django.contrib import admin
 
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^polls/', include('polls.urls')),
]

Код polls/views.py

from django.http import HttpResponse

def index(request):
    return HttpResponse("Hello, world. You're at the polls index.")

Код polls/urls.py

from django.conf.urls import url
 
from . import views
 
urlpatterns = [
    url(r'^', views.index, name='index'),
]

Решение задачи: «Django. The current URL, , didn't match any of these»

textual
                            Листинг программы 
                        
                            url(r'^', include('polls.urls'))