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?
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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.
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..
I was getting the error message that there were 2 items that could not be sync'd. For me it was ring tones. In the "Tones" window in iTunes the "all tones" button was selected (probably a default). There were 7 ring tones in iTunes that were checked but only 5 tomes physically on my iPhone. I selected "only checked tones" and then unchecked the 2 tones that were not listed on my phone. Did a sync and the message did not reappear. I would suggest looking in each of the tabs for your device in iTunes and then comparing what is there with what is on your device in the same category. You will likely find the same type of thing that I found with "Tones" From there it is as simple as making iTunes look like your device and the issue should go away.
I have figured out how to see what items it is having a problem syncing. Once the sync has completed click on your iPod/iPhone at the top left. On the left hand side is a grey label that says "On My Device". Under that are all tabs listed. Click through each one and it will show you all the items that are on your device, and it will also have the items that it has not been able to complete syncing on there. However, these items will be greyed out and will have a broken circle to the left of them.
This can be a storage issue on your phone, maybe you don't have enough free space on your phone. Try deleting some pictures.