Third party handler error while trying to activate work perfect Office

Hello,
Recently, I upgraded my Work perfect Office to latest version but now When I try to activate this program I get the following error message saying “Third Party Handler Error”. What does it mean? Have any idea to fix this issue? I need your assistance resolving this error. I am using Windows 7 Operating System.

Third Party Handler Error
Unable to load: f:CorelWordPerfectOffice X6ProgramsdocumentManagementHandler.dll
