CoolType error 'CT generic: UniStringAtom: UTF-8 str overflow'

Hi All,

   Today, I downloaded the LiveCycle Designer. After install and run it, it shows a warning dialog " CoolType error 'CT generic: UniStringAtom: UTF-8 str overflow' Because of this error the form could not be opened." . I don't know whats going on. Who can teach me how to fix it?  My OS is window 8.1.

Thanks

Perry