--- a/src/ai/api/ai_error.hpp	Thu Apr 03 22:32:28 2008 +0000
+++ b/src/ai/api/ai_error.hpp	Thu Apr 03 23:01:54 2008 +0000
@@ -54,10 +54,16 @@
 		ERR_ALREADY_BUILT,                            // [STR_1007_ALREADY_BUILT]
 
 		/** Area isn't clear, try to demolish the building on it */
-		ERR_AREA_NOT_CLEAR,                           // [STR_2004_BUILDING_MUST_BE_DEMOLISHED]
+		ERR_AREA_NOT_CLEAR,                           // [STR_2004_BUILDING_MUST_BE_DEMOLISHED, STR_5007_MUST_DEMOLISH_BRIDGE_FIRST, STR_300B_MUST_DEMOLISH_RAILROAD, STR_300E_MUST_DEMOLISH_AIRPORT_FIRST, STR_MUST_DEMOLISH_CARGO_TRAM_STATION, STR_3047_MUST_DEMOLISH_TRUCK_STATION, STR_MUST_DEMOLISH_PASSENGER_TRAM_STATION, STR_3046_MUST_DEMOLISH_BUS_STATION, STR_306A_BUOY_IN_THE_WAY, STR_304D_MUST_DEMOLISH_DOCK_FIRST, STR_4800_IN_THE_WAY, STR_5804_COMPANY_HEADQUARTERS_IN, STR_5800_OBJECT_IN_THE_WAY, STR_1801_MUST_REMOVE_ROAD_FIRST, STR_1008_MUST_REMOVE_RAILROAD_TRACK, STR_5007_MUST_DEMOLISH_BRIDGE_FIRST, STR_5006_MUST_DEMOLISH_TUNNEL_FIRST]
 
 		/** Area is owned by another company */
 		ERR_AREA_IS_OWNED_BY_ANOTHER_COMPANY,         // [STR_1024_AREA_IS_OWNED_BY_ANOTHER]
+
+		/** The name given is not unique for the object type */
+		ERR_NAME_IS_NOT_UNIQUE,                       // [STR_NAME_MUST_BE_UNIQUE]
+
+		/** The building you want to build requires flat land */
+		ERR_FLAT_LAND_REQUIRED,                       // [STR_0007_FLAT_LAND_REQUIRED]
 	};
 
 	/**