Use 'load static' instead of staticfiles

pagetree/templates/pagetree/edit_page.html

@@ -1,7 +1,7 @@
 {% extends "pagetree/base_pagetree.html" %}
 {% load bootstrap3 %}
 {% load render %}
-{% load static from staticfiles %}
+{% load static %}
 
 {% block title %}{{section.label}} (edit){% endblock %}