Reverse for 'topics' not found. 'topics' is not a valid view function or pattern name

<p>
    <a href="{% url 'learning_logs:index' %}">Learning Log</a> 
    <a href="{% url 'learning_logs:topics' %}">Topics</a>
</p>

{% block content %}{% endblock content %}

I get that error: Reverse for 'topics' not found. 'topics' is not a valid view function or pattern name. at this line:

<a href="{% url 'learning_logs:topics' %}">Topics</a>

Here I creat views:

from django.shortcuts import render
from .models import Topic

# Create your views here.
def index(request):
    """Main page for app Learning Logs"""
    return render(request, 'learning_logs/index.html')

# A view of topics 
def topics(request):
    topics = Topic.objects.order_by('date_added')
    context = {'topics': topics}
    return render(request, 'learning_logs/topics.html', context)

def topic(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic':topic, 'entries': entries}
    return render(request, 'learning_logs/topic.html', context)

Here is a template of topics:

{% extends "learning_logs/base.html" %}

{% block content %}
  <p>
    Topics
  </p>

  <ul>
    <!--this is a for loop which iterates through topics-->
    {% for topic in topics %}
      <li>
        <a href = "{% url 'learning_logs:topic' topic.id %}">{{ topic }}</a>
      </li>
    {% empty %}
      <li>No topic has been added yet</li>
  </ul>
{% endblock content %}

I am new to Django and I don't understand why this problem appeared.

Back to Top