old_contents: from django.conf.urls import include
  from django.contrib import admin
  
  
  admin.autodiscover()
  
  
  urlpatterns = [
      (r'^admin/', include(admin.site.urls)),
      (r'^account/', include('rapidsms.urls.login_logout')),
      (r'^scheduler/', include('rapidsms.contrib.scheduler.urls')),
      (r'^tree/', include('decisiontree.urls')),
  ]
  
new_contents: from django.conf.urls import include
  from django.contrib import admin
  
  
  admin.autodiscover()
  
  
  urlpatterns = [
      (r'^admin/', include(admin.site.urls)),
      (r'^account/', include('rapidsms.urls.login_logout')),
      (r'^tree/', include('decisiontree.urls')),
  ]
  
subject: Remove reference to the scheduler, which was removed.