add region prob

[Makanyane]

doublecheck you have added new regions correctly into:
data/text/campaign_regions_and_settlement_names.txt
&
In data/world/maps/campaign/campaign into:
descr_regions.txt
descr_strat.txt &
descr_regions_and_settlement_name_lookup.txt

Region names are case sensitive and generally need _ instead of space between words, follow existing format in files (region name and not city name is needed in descr_strat).

If you are replacing an existing region you also should check if old one appears in
descr_mercenaries.txt or
descr_win_conditions.txt but that doesn't sound like the right type of error.

Only other one for new regions I remember is I think someone reported that certain RGB colours don't work (don't know what message that generated though).
(EDIT: am assuming you have added new regions with unique colour in map_regions.tga)