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iTunes was unable to load data class info from sync services

by wrangler4x4 / April 16, 2010 9:25 PM PDT

Started receiving this error ever since I updated iTunes to 9.1.079.

Havn't been able to sync my itouch since. Please Help.

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iTunes was unable to load data class info from sync service
by ajdiaz / August 21, 2010 9:35 AM PDT

I was also getting this message constantly for over 2 weeks, and refused to having to install everything. I have iTunes 9.2.1 on Windows XP,and iPhone 4 iwth iOS 4. I did a whole bunch of stuff to fix this, so don't really know which one specifically helped, but here they are:

1) Uninstalled MobileMe Control from Add/Remove Programs. Downloaded it and installed it again.
2) Renamed every single DLL in the directory C:\Program Files\Common Files\Apple\Mobile Device Support\bin. Every single one, gone.
3) Went to Add/Remove Programs and Repaired (not remove, but repaired) every single Apple program, including Mobile Device Support, Apple Support, and iTunes.
4) Rebooted and iTunes started working again.

Oddly, the DLLs I renamed in the Mobile Device Support\bin remained renamed. I would think that the repair would have copied them over again. But no. They are not there anymore, and everything still works.

Hope this helps someone.

-AJD

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Fix for iTunes on Mac
by ken-ng / March 15, 2011 8:20 PM PDT
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