Hi!
Hmm, so that is why I didn't get any error messages. Thank you for telling me.
Foretunately I did backup export_descr_unit and export_descr_buildings, so after I struggled for a bit trying to get the mod to work, I replaced the modded files with the original files. Then for some strange reason the game crashed to desktop anyway.
When I was about to uninstall and re-install the game, I discovered I had made a backup of my whole Rome - Total War folder.
I replaced the one that gave the problem, and everything is fine now.
I installed the mod and it is great. I started a campaign as the saxons, and after the WRE defeated me in bridge battle, they are knocking on the gates of my capital, Campus Saxones (sp?), with a full stack, and another on the way.
Thanks for your help GrimSta.
And great mod Meqon-Nerd.