new_contents: from django.conf.urls import url
  
  from .views.transition import ExecuteAgreeTransitionView
  from .views.transition import ExecuteBackToTransitionView
  from .views.transition import ExecuteRejectTransitionView
  from .views.transition import ExecuteTransitionView
  
  urlpatterns = [
      url(r'^t/$', ExecuteTransitionView.as_view(), name="wf_execute_transition"),
      url(r'^t/agree/$', ExecuteAgreeTransitionView.as_view(), name="wf_agree"),
      url(r'^t/back_to/$', ExecuteBackToTransitionView.as_view(), name="wf_back_to"),
      url(r'^t/reject/$', ExecuteRejectTransitionView.as_view(), name="wf_reject"),
  ]
  
subject: add lbworkflow/urls.py