I recently bought a mp4 player like this from eBay
32GB 2.8 LCD Touch Web 2.0M Camera MP3 MP4 Video Player - eBay (item 110412630964 end time Jul-11-09 13:57:55 PDT)
Kind of looks a lot like an I Pod touch. But the problem I'm having is when I load a certain amount of videos files on the player, some of the files will work, and the other ones I get this error message on the screen "file does not exist" which doesn't make any sense because the file is obviously on there. I'm not sure if this is the cause or not but it's worth mentioning that I I followed the directions from this link here
http://mympxplayer.org/image-vp55331.html using Vidrop. It works fine for some files, not so well for others.
Any ideas why this is happening and how I can fix it?