iTunes 10.2: iTunes was unable to load data class information from Sync Services alert after installing Xcode 4
Symptoms
After installing Xcode 4 on a computer using Mac OS X v10.6.x, you may receive an alert when syncing an iPhone, iPad, or iPod:
Products Affected
iTunes 10 for Mac
One Moment Please
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Read more http://support.apple.com/kb/TS3744