WiFi sync failure "Error -50" - how to fix?

My iPhone 4 syncs over WiFi with iTunes without hitches most of the time. However, at seemingly random times, the sync fails. I do not get any warnings on the iPhone itself, but on iTunes there is an icon with an exclamation point next to the iPhone entry under Devices. Clicking on it shows this:
Does anyone know what this is, what causes it, and how to fix it?
Thank you.

I seem to have solved the problem by applying the fixes related to the photo problems, even though I am not syncing photos. Go figure. So, I deleted the iPod picture cache, connected the iPad with a cable, turned off WiFi syncing, synced with the cable, turned on WiFi syncing, and then synced without the cable.
I did the same for my iPad and it worked, too. One really odd thing that happened, though, was that the first WiFi sync was taking very long, and there were a lot of things being copied. I stopped the sync, went to the computer, connected the iPad with the cable and synced from there. At this point, the entire music library got copied! I clicked on the Music tab under the iPad in the devices area and saw that just about all songs had a symbol next to them, an "X" inside a circle. As the songs were being copied, these symbols disappeared. I have no idea why it did this, for I did not mess around with the music library at all! I have not even turned on iTunes Match. Anyway, the songs were copied and everything seems to be OK on the iPad. No duplicates. The other thing I noticed is that some of the album cover artwork does not show in the Artist view - but the artwork is there, you can see it if you click on the Artist name to see the album details. And, all the artwork shows fine in the Album view. Very strange.

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Ever since the arrival of iOS5 and WiFi sync's much anticipated functionality, it's been unacceptably unreliable. I have 4 iOS devices that need to be kept up-to-date, but it is impossible to achieve this without failures and errors.
This morning's experience is typical. All 4 devices are listed in iTunes (10.6.1). I downloaded the available app updates and set all 4 devices to sync. Very soon there were 2 error messages, each saying one of the devices could not be sync'd as it couldn't be found on the network - so that's a 50% failure rate. At this point the device disappears from iTunes.
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So this raises the question of what connection method is used by iTunes for it's "Sync over WiFi" option. It has been my belief (and many others on this forum) that the iTunes Mac does not need WiFi as it simply uses the IP network, however that may physically connect, but switching WiFi off then on again on my Mac, causing the devices to re-appear in iTunes would indicate that WiFi is indeed in some way required.
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