The Address Book custom properties couldn't be parsed. Invalid attribute count in "%1" at line number = "%2".Each CustomProperty ...

The Address Book custom properties couldn't be parsed. 

Invalid attribute count in "%1" at line number = "%2".Each CustomProperty element is supposed to have only two attributes. If this error isn't addressed, users won't be able to view the custom properties. The Help and Support Center provides information about how to troubleshoot this issue.