TS2690 iTunes was unable to load data class information from Sync Services reconect or try again later

My Ipad (iPad Air - iOS 7.1.2  and Ipad 2 - iOS 7.1.2) can't sync with itunes. It said: "iTunes was unable to load data class information from Sync Services reconect or try again later".
I already reset sync history but it didn't work.
They are not jailbraked.
iTunes's version is 11.3.1.2
Pls show me how to fix this error.
Thanks.

John L316 wrote:
Does anyone know what is causing this
see if this support article helps:
iTunes 10.2: "iTunes was unable to load data class information from Sync Services" alert after installing Xcode 4.

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