NoReverseMatch at / ' homepage' is not a registered namespace

I am building my django app from base.html and with child themes

and get these errors:

any help woud be appreciated.

Tim


NoReverseMatch at /
' homepage' is not a registered namespace
Request Method: GET
Request URL: http://localhost:8000/
Django Version: 2.0.6
Exception Type: NoReverseMatch
Exception Value:
' homepage' is not a registered namespace
Exception Location: /Users/timvogt/newdjango/lib/python3.6/site-packages/django/urls/base.py in reverse, line 86
Python Executable: /Users/timvogt/newdjango/bin/python3
Python Version: 3.6.5
Python Path:
['/Users/timvogt/coolapp',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
'/Users/timvogt/newdjango/lib/python3.6/site-packages']
Server time: Mon, 25 Jun 2018 20:46:07 +0000
Error during template rendering

In template /Users/timvogt/coolapp/homepage/templates/homepage/base.html, error at line 2
' homepage' is not a registered namespace
1 <p>
2 <a href='{% url ' homepage:index ' %}'>main</a>
3 <a href='{% url ' homepage:topics ' %}'>topics</a> {% block content %} {% endblock content %}

vieuws.py
from django.shortcuts import render

from .models import Topic
def index(request):
"""the homepage for the homepage"""
return render(request, 'homepage/index.html')

def topics(request):
"""show all topics"""
topics = Topic.objects.order_by('date_added')
context = {'topics': topics}
return render(request, 'homepage/topics.html', context)
# Create your views here.




base.html
<p>
<a href='{% url ' homepage:index ' %}'>main</a>
<a href='{% url ' homepage:topics ' %}'>topics</a> {% block content %} {% endblock content %}

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