For some reason, I keep getting an error whenever I go to fight a battle with a captain, as opposed to a general.

The error states:
"Script Error in RTRPE/data/descr_model_battle.txt, at line 689, column 22.

Model database failed to load model data/models_unit/Early_General.cas."

I'm using a different model and texture from Ferres' "Modding Legions", so it is not located in the RTR folder. I did that intentionally. Everything is spelled exactly the same, I have checked it several times. And the file is definitely there. Any ideas?