i just bought the youtube niche script. the main page is appearing fine but when i try to click on the keywords or a video im getting the following error

Not Found

The requested URL /video/atrL9CwBl-k/Uchi-Vaguntheduthu-Songs-by-Rosapoo-Ravikaikari-tamil-video-songs-download-video-song-mp3-free.html was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.