'OrderCreateView'对象没有属性'object_list'为什么？

Question

它正在工作，今天我有这个错误，为什么？

get_context_data中的

/root/.local/share/virtualenvs/pp-lX8UY0eG/lib/python3.7/site-packages/django/views/generic/list.py，行115 AttributeError：'OrderCreateView'对象没有属性'object_list'
views.py

class OrderCreateView(LoginRequiredMixin, CustomSuccessMessageMixin, CreateView, ListView):
    model = Order
    template_name = 'index.html'
    form_class = OrderForm
    success_url = reverse_lazy('orders')
    success_msg = 'Заказ сохранён'
    # this method will pass 'user' as param in kwargs to form __init__()
    def get_form_kwargs(self):
        kwargs = super(OrdersInfoView, self).get_form_kwargs()
        kwargs['user'] =  self.request.user
        return kwargs
    def get_context_data(self, **kwargs):
        kwargs['list_orders'] = Order.objects.all().order_by('-id')
        kwargs['customer_form'] = CustomerOrderForm
        return super().get_context_data(**kwargs)
    def form_valid(self, form):
        self.object = form.save(commit=False)
        self.object.author = self.request.user
        new_number = self.object.author.order_set.count() + 1
        self.object.number_order = str(new_number)
        self.object.save()
        return super().form_valid(form)