I get this message when i try to sync and download my iphone:  itunes was unable to load data class information from sync services, reconnect or try again later.  what does that mean and who do you fix it

I get this message when i try to sync and download my iphone,   ITUNES was unable to load data class information from sync services,  reconnect or try again later.    this has happened twice.  i have not downloaded by phone in several months.  the first time i got this message i did not understand i and left my phone plug in for 12 hrs and it never did anything.   today.  when i got the message i just unplugged it.
help

http://support.apple.com/kb/TS2690?viewlocale=en_US&locale=en_US

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