Server error in KAddressbook

When I open the KAddressbook browser I get the following error message:

Server sent error -1: Received invalid XML markup: tag mismatch at 5:7

I'm unable to edit individual records, and the program freezes (unresponsive 
to buttons/menus being clicked). Can anyone suggest an easy fix? I don't 
really want to delete my address book data and start again :(
-- 
Bob

openSUSE 10.3, Kernel 2.6.22.13-0.3-default, KDE 3.5.8
Intel Celeron 2.53GB, 2GB DDR RAM, nVidia GeForce 7600GS