Nextway NMP-100c Player

Question

Hi, i've got quite an annoying problem with the NMP-100c Both the built in 64mb and the extra 64mb card i have in it won't play the music.When i turn it on it simply says "No Code"At first this only happened to the built in memory, but now it's happened to the extra card.Have i pressed anything i shouldn't have?Can i by any chance make the music that i put in again?Thank you./Murvl