base.html

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Am trying to add a topic to my base.html and its telling me learning log is not a name space .

here is the code for the base.html modified 

<p>

<a href="{% url 'learning_logs:index'% }">learning log</a> -

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

</p>

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