Diz

Hi, I am trying to transfer mp3 files from my hardrive/musicdrive to my Net MD. When I click on transfer, the files start converting but then i get an error with a list of the names of the songs I am trying to transfer and a message that says that Sonic Stage does not support the file format. Am I doing something wrong or is my NetMD defective? I am using sonic stage 2.0 and have uninstalled it and reinstalled.