include app name

[dauntlessnomad]

https://github.com/codingforentrepreneurs/eCommerce/blob/fc97ee8fd094a47aeb47ad7b25cf2d5a04c78fe8/src/ecommerce/urls.py
url(r'^products/',include(('products.urls', 'products'), namespace='products')),
showing error on django 2.0+ without the above change

[RommelTJ]

As Justin explains in his videos, the course was specifically written for the LTS version of Django (1.11). You can read here for more information and discussion.

[vishalkallem]

Remove the namespace parameter from the url and try to add

app_name = 'products'

in products->urls.py file.

[shubham1811]

simply add the
app_name = 'products'
in the url.py of the product before the urlpatterns