Please Explain

[Trevarian]

Alright, I've been playing RS for as long as I can remember now, and any time I had a minor problem I was able to figure it out and fix it myself, now it seems my luck has run out.

I had upgraded to RS2.5, but after a while I decided to go back to RS2.1a. So, I got a clean install of RTW and then reinstalled RS. Now I'm getting this ridiculous error.

Script Error in play_rome_one_turn/data/export_descr_unit.txt, at line 377, column 18

Unrecognised mount type 'light horse'

Any suggestions?

Edit: Fixed, please close.