Syncing with Aperture causes "The iPhone cannot be synced (-50)" error

[Sirolway]

Hi all

When I try to sync my iPhone 3GS (v4.3.5) I get the error

"The iPhone ... cannot be synced. An Unknown error occurred (-50)"

My Aperture library is 100% referenced photos on my local hard disk (about 200GB)

If I only sync "In The Last Week" photos, it works.
If I sync "In The Last Month", I get the above error

I have repaired the Aperture database, repaired disk permissions, viewed all the photos in the "In The Last Month" smart album within Aperture to make sure they can all be found & viewed (they can)

And I'm running out of things to try - I could wipe the iPhone, but are there any other ideas out there?

I was getting the same thing with my iPad, so I suspect this is an iTunes / Aperture issue, rather than an iPhone issue...

Help!