That's one funky error 'cause:
Code:
1764 |  level city
1765 |  region Latium2
In:
Code:
settlement
{
	level city
	region Latium2

	year_founded 0
	population 8770
	settlement_tax 51
	plan_set default_set
	faction_creator seleucid
	building
	{
		type core_building governors_palace
	}
	building
	{
		type uniques1 oneone
	}
	building
	{
		type defenses stone_wall
	}
	building
	{
		type amphitheatres game_field
	}
	building
	{
		type equestrian stables
	}
	building
	{
		type healing doctor
	}
;WG	building
;	{
;		type Barracks_A city_barracks_A1
;	}
	building
	{
		type smith blacksmith
	}
;WG	building
;	{
;		type hinterland_roads roads
;	}
	building
	{
		type port_buildings shipwright
	}
	building
	{
		type farms2 grain_silo
	}
	building
	{
		type market market
	}
	building
	{
		type hinterland_farms farms+2
	}
	building
	{
		type temple_of_governors temple_of_governors_large_temple
	}
}
Which would indicate a wrong location of the single black pixel in the Latium (as seen in the game) province... Ooh now our Scripters are gonna be really, really unhappy.