Page not found (404)

Request Method: GET
Request URL: http://www.calendarey.net/sets/product/51/
Raised by: calendarey.sets.views.SetsProductDetailView

Не найден ни один Продукт комплектующих, соответствующий запросу

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.