diff -r e4feb2f9fedf -r b3849a19d137 src/ai/api/ai_error.hpp
--- a/src/ai/api/ai_error.hpp	Mon Apr 07 22:08:28 2008 +0000
+++ b/src/ai/api/ai_error.hpp	Tue Apr 08 07:19:02 2008 +0000
@@ -39,6 +39,7 @@
 		ERR_CAT_TILE,     //!< Error messages related to raising / lowering and demolishing tiles.
 		ERR_CAT_SIGN,     //!< Error messages related to building / removing signs.
 		ERR_CAT_ROAD,     //!< Error messages related to building / maintaining roads.
+		ERR_CAT_ORDER,    //!< Error messages related to managing orders.
 
 		/**
 		 * DO NOT USE! The error bitsize determines how many errors can be stored in