Page not found (404)

Request Method: GET
Request URL: http://monnis.com/%D0%B5%D1%80%D3%A9%D0%BD%D1%85%D0%B8%D0%B9-%D0%BC%D0%B5%D0%BD%D0%B5%D0%B6%D0%B5%D1%80/

Шүүлтүүрт таарах slug олдсонгүй

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.