Export Captivate Projet in a Word Document

Hello, I wish to export my lesson, from an Adobe Captivate projet to a Word Document. I used do this several time, but now I have an error message who explain me that is impossible for 2 possible causes  : – My project is close or -Microsoft Word is not install on my computer.   But Microsoft Word is install, and my Captivate Project is already open.   If you have an answer, thanks   Christophe