Error duing iphone sync:  The iphone cannot be synced.  An unknown error occurred (-50).

I am trying to Sync my 3GS with itunes, and I get the error message:  The iphone cannot be synced.  An unknown error occurred (-50).
Latest rev of itunes installed.
Any suggestions on a fix?
Starkw1

I'm having the same issue.  After updating all iOS devices to iOS 6, then updating all software on my iMac to the latest versions (including iPhoto 9.4), everthing was working as it should.  I was able to sync all of my devices (New iPad, iPod Touch, iPhone4) with the iMac early this morning.
Subsequently, I opened iPhoto for the first time since installing 9.4, a window popped up informing me that my photo library had to be converted to work with the iPhoto 9.4.  I clicked okay, and let the conversion process run its course.
About ten minutes later, I attempted to once again sync my iPad with the iMac.  The sync process would run for a few seconds, then stop with a window popping up saying "The iPad cannot be synced. An unknown error occurred (1140)".  I then attempted to sync the iPod and my iPhone, with the same results.
After consulting the discussion forums, it looked like lots of other users are encountering the same problem, and that it was somehow related to the new iPhoto.  Someone suggested turning off syncing photos from iPhoto, which I did.  With photo syncing turned off, the rest of the sync program now runs without a problem.
I've submitted a bug report to Apple.  Hopefully, enough other users have done the same, and Apple will fix whatever it is that's causing the problem.

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