Djago URL conf error

I have the following message when I try to use reverse or reverse_lazy:

The included URLconf 'ph.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import

When I use the urls (without using reverse or reverse lazy) is working with no issue. I tried different combination of urls the same results

What I'm doing wrong ? ph is the project. In the project I include the urls for the application:     url(r'^account/', include('accounts.urls', namespace='accounts')),     url(r'^companies/', include('companies.urls', namespace='companies')),     url(r'^products/', include('products.urls', namespace='products')),     url(r'^admin/', admin.site.urls) The app involved: 1)accounts: from django.conf.urls import url from .views import AccountDetailView urlpatterns = [      url(r'$', AccountDetailView.as_view(), name='dashboard'), 2) products: class ProductCreateView(AccountMixin, CreateView):     model = Product     form_class = ProductModelForm     url = reverse_lazy('accounts:dashboard')     url2 = reverse_lazy('products:list')     #print(url)     template_name = 'accounts/product_form.html'     #success_url = reverse_lazy('accounts:product_detail')

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