{% extends "base.html" %}
{% load extras %}

{% block title %}This article does not exist -{% endblock %}

{% block body_class %}article{% endblock %}

{% block content %}
<div id=article class=serif>
    <div class=no-article>
        <h1>An article with the slug {{ slug }} does not exist.</h1>
        <h2><a href="{{ create_url }}">Create it?</a></h2>
    </div>
</div>

{% endblock %}

{% extends "base.html" %}
{% load extras %}

{% block title %}This article does not exist -{% endblock %}

{% block body_class %}article{% endblock %}

{% block content %}
<div id=article class=serif>
    <div class=no-article>
        <h1>An article with the course code {{ slug }} does not exist.</h1>
        <h2><a href="{{ create_url }}">Create it?</a></h2>
    </div>
</div>

{% endblock %}

Rename 'slug' to 'course code'
Rename 'slug' to 'course code'