I get error message iTunes could not sync calendars to iPhone because an error occurred while merging data

I get error message iTunes could not sync calendars to iPhone because an error occurred while merging data on my wifes phone how do you correct problem without losing calendars info on phone.

One thing that might help.
1. open itunes preferences from the edit menu and click on the devices tab.
2. check the box to disable syncing for iphones connected to itunes and click ok.
3. Then click the button to reset sync history.
4. Now click ok to close the preferences window.
5. connect the iphone to itunes and go to the info tab.
6. scroll to the bottom of the info page and check the box to replace the ical data on the iphone.
7. then click apply on the bottom right of itunes.
This will overwrite any events on the iphone, including any events that has become corrupted.
Hope this helps

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    Header 1
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