XML schema validation failed for the file "%1" at line %2. The error was "%3". A Unified Messaging configuration data file ...

XML schema validation failed for the file "%1" at line %2. The error was "%3". A Unified Messaging configuration data file has been modified and the new changes don't match the expected schema for the file. To resolve this issue, undo any recent changes you've made to the file or replace the file on the server with the file of the same name in the Exchange Server 2013 source files.