Python – Reverse {% url %} : Reverse for ‘”‘ not found. ” is not a valid View function or schema name

I’ve been holding on for a while and can’t seem to fix the bug. I didn’t use reverse() anywhere in View.

urls.py

urlpatterns = [
    url(r"^book/", include("bookings.urls")),
]

bookings.urls.py

from django.conf.urls import url
from . import views

app_name = 'bookings'

urlpatterns = [
    url(r'^charge/$', views.charge, name='charge'),
    url(r'^booking/$', views.booking, name='booking'),
]

views.py

def booking(request):
     # some code
     render(request, 'bookings/template.html', {'listing': listing,})
def charge(request):
    # some code

template.html

<form action="{% url 'bookings:charge' %}" method="post">

I tried all the different changes and namespaces, e.g. trying to use only charge, different namespaces in urls.py, etc.

When I render book/booking/, I get the following error:

Reverse for ‘charge’ not found. ‘charge’ is not a valid view function
or pattern name.

If you want to use URL tags that way, you need to have a namespace in your urls.py.

url(r"^book/", include("bookings.urls", namespace="bookings")),

You can then include {% url 'bookings:charge' %} in the template.