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iTunes was unable to load data class information from Sync Services

I started to get the following message from iTunes:


iTunes was unable to load data class information from Sync Services


I searched the forums and found a solution from Apple that indicated that one should uninstall iTunes and reinstall. However the issue is that on Mountain Lion attemping to move iTunes into the trash causes a message to be displayed indicating that it cannot be deleted because it is part of the operating system. I also attempted to simply download the latest version of iTunes and reinstal it but during the installation an error occurred that said the installation couldn't be completed.


Any ideas on how to solve this problem are appreciated as I understand that Sync Services are required in order to allow backups to be restored to iOS devices.

Posted on Nov 15, 2012 7:55 PM

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21 replies

Nov 16, 2012 8:27 AM in response to rsaccone

I am having the same problem, and it appears to have just started. iTunes was just updated to 10.7, but if I click the OK button, the sync appears to go ok. I will have to ignore the error until Apple decides to unbreak their software.


Reconnecting does not help. Also, following the Apple knowledge base is useless, because it refers to buttons that are no longer available on iTunes program, at least on the mac. So, using the Apple knowledge base is useless for this error.


I am on a iMac 27", so this must be something Apple software update introduced, not a Windows bug.

iTunes was unable to load data class information from Sync Services

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