Error message when syncing Ipad: unable to load data class

for the past hour my itunes have been trying to sync.  it's on step 2 of syncing ipad and it's been on that for a while.  when I get to step two, after it asks me if I want to sync my purchased on my ipad to itunes, I click ok.  then i keep getting the follow error message: itunes was unable to load data class information from Sync services.  reconnect or try again later.
I keep trying and this message keeps popping up on step two;
then in itunes when I click on my ipad under devices, itunes will freeze. 
I can't figure out what happened.  when I previously synced I had no problem and it was quick.
Please help.
thanks

See Here for
Backup and Set Up as New Device
http://support.apple.com/kb/HT4137

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