Page not found (404)

Request Method: GET
Request URL: http://jet-english.mn/our-courses/%D0%B1%D0%B0%D0%B9%D0%B3%D1%83%D1%83%D0%BB%D0%BB%D0%B0%D0%B3%D0%B0%D0%B4-%D0%B7%D0%BE%D1%80%D0%B8%D1%83%D0%BB%D1%81%D0%B0%D0%BD-%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8-%D1%85%D1%8D%D0%BB%D0%BD%D0%B8%D0%B9-%D1%81%D1%83%D1%80%D0%B3%D0%B0%D0%BB%D1%82/

No slug found matching the query

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.