Video, music, and photo galleries not working

Hey everybody, I was having trouble with the different media galleries. When I try to click on them in the navigation bar, it sends me to a page that doesn't exist. Is it because nobody has uploaded anything yet? I guess I will try that and come back if it still doesn't work. In the mean time, if this is a known problem, please help.

My site is: http://www.creotic.com/

Thanks a lot.

Yeah, I tried uploading things as a test, but it still doesn't work. I've tried enabling and disabling the friendly permalinks, but nothing seems to work. I really need help.