Page not found (404)

Request Method: GET
Request URL: http://ecrc.mn/%D3%A9%D1%80%D1%81%D3%A9%D0%BB%D0%B4%D3%A9%D1%85-%D1%87%D0%B0%D0%B4%D0%B2%D0%B0%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.