Problem Syncing iPhone with iMac

Hello,
My iPhone has been working and syncing (with new iMac) just fine - until tonight. I plug in iPhone. It shows up in iTunes. I have Automatic sync checked. But, within less than a minute, I receive this error message:
"iTunes could not sync contacts to the iPhone [name] because the iPhone disconnected"
I also get same error message when I click "Sync" button in lower right of iTunes window. Obviously, I did not disconnect the phone as the error message alleges.
I have rebooted computer. I have recycled iPhone (top right switch off, then on). I have changed iPhone cord plugged in back of iMac screen. I have ejected iPhone, removed plug and reestablished connection.
I need to sync my contacts from iMac Address Book. Can someone please identify the problem and solution?
Thank you,
Dale
Note: The iPhone was updated several days ago to 1.1.3. Syncs have taken place successfully SINCE the upgrade prior to tonight.

With your iPhone connected and available with iTunes, under the Info tab for your iPhone sync preferences under replace information on this phone, select Contacts and then sync. This will replace all contact information on your iPhone with what is available in the Address Book application.

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