Please help! mp3 files will not transfer getting error message.

I’m a new user who loves the 8 gig Clip! But suddenly I cannot transfer mp3s or podcasts to my clip.  I’m using WMplayer and Rhapsody.  I’ve got about 2 gigs of mp3’s on the clip now but I can’t add any new mp3s or podcasts.  I’m getting a general error message.  the clip starts to write and then stops then i see the error message on rhapsody or wmplayer.  PLEASE HELP! I need new music!! Thanks