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Every time I sync my iPhone or iPad (both running iOS 5) with iTunes, I get this error. iTunes displays no information that I can find about what the mystery six unsynced items are. How do I find out - any ideas?

iTunes Sync error message

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Anything else? Messages in your console? Out of space errors or warnings on the iOS device? –  bmike Oct 31 '11 at 21:01
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Nope, nope, nope and nope, in that order. :) –  Simon Whitaker Oct 31 '11 at 21:32
    
I had this issue on one Mac where I had downloaded some WWDC content that could only be gotten as a paid iOS Dev. (presumably due to NDA and Pre iOS 5 release) It was hidden in iTunes but still partially syncing to a new device. Somewhere to look in case iTunes is hiding any content that could be in error. (It's a long shot) –  bmike Nov 1 '11 at 13:54
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2 Answers 2

up vote 2 down vote accepted

I've typically seen this when some thing is trying to be synced from the computer to the device that is incompatible - like videos. Try syncing again (with usb), but uncheck each category of items (Books, Music, Movies, etc) each time before you test. At least you should be able to narrow down the issue.

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Yeah, I've tried that but the results have so far been somewhat confusing. Unticking photos seems to help, but then re-ticking photos doesn't bring the error back, then the error just starts appearing again a few syncs later! At this point I'm tempted to think photos are the problem in my case, but this inconsistency around when the error appears is hampering this kind of iterative approach to narrowing down the problem. Grrr! –  Simon Whitaker Nov 2 '11 at 15:01
    
OK, got there in the end using your method and USB. The problem is with 6 videos in iPhoto that were shot on my Canon S95 camera, and appear to be in a format that iOS can't handle. Unticking "Include videos" in the Photos tab in iTunes for my iPhone solves it (but also prevents syncing of iPhone-shot video). –  Simon Whitaker Nov 2 '11 at 15:27
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I haven't got a solution to this yet, but I get the same error (342 items though). The reason appears to be that the iPhone contains 342 hidden voice memos, not appearing within the voice memo app, but viewable (and playable while the iPhone is connected through USB) in the iPhone Device list in iTunes (click the triangle left to the device, see the voice memo playlist).

I will backup and restore to factory setting now. But I'm fearing that the voice memos will be back there when I restore the backup. But then again, I might be lucky.. :)

UPDATE; It did in fact work, I did get rid of the hidden voice memos and the "could not sync" message! Great.

Thoughts on how the hidden memos got there in the first place; I did mess around with the location of the Voice Memos playlist in iTunes, moved it in under a playlist folder, back and forth a couple of times, synced between, in addition to choosing to sync voice memos and not. It was all me testing how the (not intuitive) Voice Memos syncing works. Not sure if this produced the problems though.. but date stamps etc support the thoughts..

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Since you've updated this post to include an answer, I've undeleted it –  Kyle Cronin Nov 1 '11 at 23:04
    
Thanks. In my case I don't have any voice memos (hidden or otherwise), but looking at your reply and @bmike's comment to the original question it clearly appears to be different media types causing this for different people. I've +1'd your answer because I think it's useful evidence, but the answer I'll accept will be the one that gives a generic solution. Hope that's OK. :) –  Simon Whitaker Nov 2 '11 at 14:59
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