HTC Droid Eris :: Double Twist For Music On Handset

I dl'd Doubletwist to my computer to sync music from itunes to my Eris. The first step of syncing music from itunes to DT was easy as pie. I literally dl'd DT in less than a minute and a minute later all my itunes songs (not too many actually) were in DT. DT looks almost exactly like itunes, except you buy your songs via Amazon. Anyway, step 2 of getting the music on to the Eris is NOT working. Any ideas would be greatly appreciated. I'm using Vista, 64 bit, if that makes a difference.