HT201269 Trying to synch my new iphone5 with my computer but keep getting the message an unknown error occured 1140

Just bought a new iPhone 5 and trying to synch it to my iMac via USB cable. It goes through the motions  then the message appears - cannot be synched an unknown error has occured (1140).
Never had any problems with my iPhone4 .
Any suggetions gratefully received

Read http://forums.macrumors.com/showthread.php?t=1449319

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