The iPhone cannot be synced. An unknown error occurred (-39).

Last couple of days--since the new 4.3.5 update, it seems--I have been getting this message each time I try to sync my iPhone:
The iPhone cannot be synced. An unknown error occurred (-39).
Or, sometimes, I get this one:
The iPhone cannot be synced. The required file cannot be found.
It's happening in Step 4 of 4 of the sync, during photo deletion.
Any ideas how to resolve this, please? I've restarted the iPhone and computer, both, numerous times but can't seem to shake this one loose.
Thanks!

Did a little digging online and found a solution:
This error is associated with the iPhoto library.
Navigate to <username>/Pictures/iPhoto Library
Right-click on iPhoto Library and show package contents.
Remove the folder iPod Photo cache (delete it, move it to Trash or whatever - just remove it from the iPhoto Library).
Sync the iPhone. The photos will reverify and it's done. Almost. It will take some time if you have thousands of images...
Source: http://forums.macrumors.com/showthread.php?t=445821

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The iPhone cannot be synced. An unknown error occurred (-39).

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