Error message while reconverting file from XLIFF to Word 97-2003

Hello,

I have a big file and when I'm trying to finalise it I get the following error message: Sdl.FileTypeSupperot.Framwork.Adapter.Framework1.Writer. Can you help me? I'm working with Studio 2014 and the original files were in Word 97-2003.

Thanks a lot!

Susanne