I tried looking for a solution on the forums, but couldn't find one, so I'm sorry if this question has already been answered... but I really need the help.

Anyways, I'm recently installed JoomSEF, and I configured the settings properly and got everything working. I managed to finally auto-rewrite the URLs to what I wanted them to be... but sadly whenever I go to the page of the new URL, it takes me to a 404 page.

Site:
kingdomhearts3.com/joomla/



So I want the article to appear on (for example)
kingdomhearts3.com/joomla/kh/worlds
And JoomSEF has rewritten the URL to make that happen- but it's not happening. It keeps taking me to the 404 page (which redirects to the main page) and it just wont work...

Help please?