Iphone cannot be synced unknown error 1156

For some reason, when I tried to sync my iPhone 4 (iOS 6) today, I got this error on my iMac and it showed my iPhone as being 'overfull' - which ws intreresting!
I carried out a restore to original settings and restored from a backup I made about 3 weeks ago - but got the same problem.  I was backing up using the cable or wireless with the same response.
I wonder if there is a problem with the port on my iPhone, because it is now syncing, but only after I removed the cable and replaced it more carefully.  It will take some time to sync my music, and it is doing it, but my apps and photos are missing.  Will these be synced in turn?
That'll teach me to cancel my iPhone 5 order!
Thanks

I had the same problem.  Happened twice in a row.  So I shut down itunes and opened it up again.  Problem solved.  Worked for me, anyway.  Good luck.

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