It feels great to ask this question --
Are you jailbroken?
If you're trying to sync thru a USB hub, try connecting to a USB port on the computer. I was having trouble syncing from the keyboard dock or thru my hub. Plugging into the port on the computer made my problems go away.
i'm connecting directly to a MacBook Pro.
i've received this error a few times since i got my iPad.
the error popped up when i was syncing both my iPhone and my iPad.
it never happened before and i dont own a USB hub.
FYI
peace,
L