The Outlook Web Access web application failed to parse the Address Book custom properties. RootElementNotFound in "%1" at ...

The Outlook Web Access web application failed to parse the Address Book custom properties. 

RootElementNotFound in "%1" at line number = "%2" . Please ensure that this file contains  "CustomProperties" as the root element. If this error is not addressed, users will not be able to view the custom properties. The Help and Support Center provides information about troubleshooting  this issue.
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