old_contents: from django.urls import path
  from .views import LTILaunchView, LTIToolConfigView, logout_view, logged_out_view
  
  urlpatterns = [
      path('', LTILaunchView.as_view(), name='index'),
      path('launch', LTILaunchView.as_view(), name='launch'),
      path('config', LTIToolConfigView.as_view(), name='config'),
      path('logout', logout_view, name="logout"),
      path('logged-out', logged_out_view, name="logged-out"),
  ]
  
new_contents: from django.urls import path
  from .views import LTILaunchView, LTIToolConfigView, logout_view, logged_out_view
  
  app_name = 'lti'
  urlpatterns = [
      path('', LTILaunchView.as_view(), name='index'),
      path('launch', LTILaunchView.as_view(), name='launch'),
      path('config', LTIToolConfigView.as_view(), name='config'),
      path('logout', logout_view, name="logout"),
      path('logged-out', logged_out_view, name="logged-out"),
  ]
  
subject: Add app_name to url module