The unit "barb archer slave" has an officer associated with it, in the line

Code:
officer          barb_warguard
whereas none of the other archer warbands has an officer. The officer turns up wrongly anyway, as a blue chosen swordsman. I think this line should be deleted, or at least an officer should be changed (maybe to barb_standard, but I don't think so, since none of the regular, i.e. not chosen, archer warbands have one).