iOS5 beta 9 & Itunes 10 beta 9 "could not be synced..." problem

[sub junkie]

I just recently decided to try the iOS5 beta, and jumped right into beta 9 for both my phone and itunes. First time I did it, I upgraded to iOS5 through a previous version of itunes (I think 10.4.4? cant remember...) and had to upgrade to itunes 10 beta 9 to be able to "use this phone with itunes" or something like that. So I upgraded. I'm on a macbook pro, 10.6.8, and I am always getting the "the iphone "xxxxxxxx" could not be synced because the sync session failed to start." every time I try to sync. What do I do to fix this? I've tried re-installing Itunes, deleting it from the comp, and installing it again with no luck...