can't see why it would unless you'd imported some files from BI!

The file in BI that looks for that is descr_cultures.txt
large_city
{
normal bi/data/models_strat/residences/barb_large_city.CAS, settlement_barbarian_level_2
wall data/models_strat/residences/roman_large_city_wall_1.CAS
The BI items db file might also have a reference to it.

Have you been trying to increase the walls/city levels that barbarian culture can build?