NPC 31845 class not found
java.lang.NullPointerException
        at com.equal.gameserver.GeoEngine.nGetSpawnHeight(GeoEngine.java:848)
        at com.equal.gameserver.GeoEngine.getSpawnHeight(GeoEngine.java:97)
        at com.equal.gameserver.model.L2Spawn.intializeNpcInstance(L2Spawn.java:
483)
        at com.equal.gameserver.model.L2Spawn.doSpawn(L2Spawn.java:446)
        at com.equal.gameserver.model.L2Spawn.init(L2Spawn.java:370)
        at com.equal.gameserver.datatables.SpawnTable.fillSpawnTable(SpawnTable.
java:113)
        at com.equal.gameserver.datatables.SpawnTable.<init>(SpawnTable.java:60)

        at com.equal.gameserver.datatables.SpawnTable.<clinit>(SpawnTable.java:4
5)
        at com.equal.gameserver.GameServer.<init>(GameServer.java:251)
        at com.equal.gameserver.GameServer.main(GameServer.java:418)