everytime i download a song and sync it theres this pop up window that says that it can`t be copied onto the ipod because the file can`t be found =\. i don`t get it. it was working fine a few weeks ago now it won`t sync in the song. sometimes it says it can`t sync it but it ends up in my ipod anyway. i don`t understand. theres plenty of space and ive downloaded songs from the websites i usually download music with. HEEEEELPPPPPP!