Conversion to PDF Failed: PDF Conversion Failed: -8

I have Primo PDF installed on my Windows XP machine. The conversion usually worked fine on my other machine.
But just this Windows XP is giving issues with Primo PDF software. When I try to do a conversion it pops up an error message:

Conversion to PDF Failed: PDF Conversion Failed: -8
I have a word document which I am trying to convert. The print preview of the word document works fine. But when it comes to converting it to a PDF file, it throws the above error message.
Please help.
