Logging null building

src/engine/objects/Mob.java

@@ -1558,14 +1558,14 @@ public class Mob extends AbstractIntelligenceAgent implements Delayed {
                 this.agentType = AIAgentType.GUARDCAPTAIN;
                 this.spawnDelay = 600;
                 if (this.building == null)
-                    Logger.error("Captain : " + this.getObjectUUID() + " : " + this.buildingUUID);
+                    Logger.error("Captain : " + this.getObjectUUID() + " missing building " + this.buildingUUID);
                 this.guardedCity = ZoneManager.getCityAtLocation(this.building.getLoc());
                 break;
             case GuardWallArcher:
                 this.agentType = AIAgentType.GUARDWALLARCHER;
                 this.spawnDelay = 450;
                 if (this.building == null)
-                    Logger.error("Wall Archer : " + this.getObjectUUID() + " : " + this.buildingUUID);
+                    Logger.error("Wall Archer : " + this.getObjectUUID() + " missing building " + this.buildingUUID);
                 this.guardedCity = ZoneManager.getCityAtLocation(this.building.getLoc());
                 break;
         }