Crappy Mp4 :(

So today my father went away for a hiking trip, this is GREAT. Anyways, I tried uploading a bunch of songs into my mp4 (mainly A. Lambert songs, duh), but when I hit the play button, it said 'format error'. so basically it's effing useless, i can only use it to listen to the radio. I need to buy a new one, i tried changing the format, but NO LUCK. STUPID, MORONIC, EXASPERATING, CRAPPY PIECE OF SHIT :)