Publish to PDF is inactive

Can you anyone help please?

I've spent days on this A4 single page and I want to take to print (NOW) via 'Publish to PDF' but this file has 'greyed out ' that option on the icon.

I've tried EVERYTHING without success though my experience IS limited. Most of my other files work on this version - Corel 10. I've even tried dragging it (and copyingit) onto a working page but all I get is a little gallows symbol - a bad portent!

Thanks, Johneltin