@carebearkiller
I did some testing. Sadly for you I could not repeat the bug regarding the balkan archers.
Look here:
Did you change anything prior to the bug occurence?
Most times such a crash is related to a missing unit model, tied to the modeldb.
In your case the balkan archers.
If you want to you could upload a savegame where you experience the crash and I will take a look at it.
Otherwise I could only advise you to make a fresh install of the mod and see if this eliminates the issue.
Sorry I could not be of great help for now.