问Error ImproperlyConfigured DetailView Django 1.8

EN

ImproperlyConfigured at schedule/confirmed/c4e068dc-9e89-4fa5-9a66-cfb5ec6a306b/
ScheduleConfirmed is missing a QuerySet. Define ScheduleConfirmed.model, ScheduleConfirmed.queryset, or override ScheduleConfirmed.get_queryset().

# views.py
class ScheduleConfirmed(generic.DetailView):
    modal = Schedule
    template_name = 'schedule-confirmed.html'

    # def get_context_data(self, **kwargs):
    #     context = super(ScheduleConfirmed, self).get_context_data(**kwargs)
    #     obj = self.object
    #     return context

#urls.py
    url(r'^schedule/confirmed/(?P<pk>[^/]+)/$', views.ScheduleConfirmed.as_view(), name='schedule_confirmed'),

#models.py
class Schedule(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    creator = models.ForeignKey(User, related_name='schedule_creator')
    # ...