Page not found (404)

Request Method: GET
Request URL: http://gazificator.ru/catalog/%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE%D0%BE/

Не найден ни один Категория, 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.