Error -50 when trying to sync photos

we have a 3 gen red nano that is just over 1 year old. When trying to sync photos, we get a message that the idod can't be synced. An unknown error (-50) occurred. Can anyone please help??

I am having the same problem, but I didn't install Lion yet. I have iTunes 1.4 (80) though, I suspect it started happening after updating to it. (I am still running Snow Leopard because one of the 3rd party audio drivers I need for my work has to be updated for Lion first).
I am syncing to my iPhone 4 to my Aperture 3 library. I haven't had this issue before. It syncs everything else but when iTunes goes from "Analyzing Photos" to "Optimizing Photos" in the sync process it reports that it is unable to sync because of an "unknown error (-50)"
To resolve the problem, I tried the following:
I repaired my Aperture library database (using Option+Command when launching Aperture 3).
I deleted the "iPod Photo Cache" folder inside my Aperture library. It had to resync all my photos again, this time it worked when re-syncing the entire library, but the next sync it had the same error again.
Updated my iOS to the latest version.
Repaired Disk Permissions on my Mac.
I changed USB cables and ports (using only ports directly on my Mac Pro).
Tried syncing with only iTunes running.
Doing all the above made no difference, I am still getting the error message and it won't sync new photos back to my iPhone 4 now. It is very frustrating.

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