Has abybody succesfully added a new culture to R:TW 1.5?

I've tried to add BIs nomad culture to 1.5 and made the necessary entires in the

descr_banners.txt
descr_cultures
descr_settlement plan
descr_sm_settlements
descr_sm_forts_ports_watchtowers.txt
menu_english.txt

files and added the ui files from BI.

Finally I got this error message:



it seems to me that the .exe doesn't recognizes the cultures anymore correctly if there are more than six.