[SOLVED] 'chatterbot' is not a registered namespace

'chatterbot' is not a registered namespace

I just clone the chatterbot api and tried to run the django_app from examples as python manage.py runserver. I'm facing this issue. 'chatterbot' is not a registered namespace Can any one explain the error and what should I do?

app.html:

 var chatterbotUrl = '{% url "chatterbot:chatterbot" %}';

urls.py:

from django.conf.urls import url
from django.contrib import admin
from chatterbot.ext.django_chatterbot import urls as chatterbot_urls
from example_app.views import ChatterBotAppView, ChatterBotApiView


urlpatterns = [
    url(r'^$', ChatterBotAppView.as_view(), name='main'),
    url(r'^admin/', admin.site.urls, name='admin'),
    url(r'^api/chatterbot/', ChatterBotApiView.as_view(), name='chatterbot'),
]

Further info:

Request Method: GET
Request URL:    http://127.0.0.1:8000/
Django Version: 2.1.2
Exception Type: NoReverseMatch
Exception Value:    
'chatterbot' is not a registered namespace
Python Version: 3.6.7

Note: I have already checked this link but of no use.

Solution

For future reference to others.

I was able to resolve the issue. In nav.html replace this 21-line i.e., <a class="nav-link" href="{% url 'chatterbot:chatterbot' %}">API</a> with <a class="nav-link" href="{% url 'chatterbot' %}">API</a>. This will sort out the issue and NO NEED TO CHANGE ANY PART OF CODE EXPECT THIS LINE, KEEP THE CODE AS IT IS CLONED.