NPC class not found
java.lang.ClassCastException: net.sf.l2j.gameserver.model.L2PetInstance
        at net.sf.l2j.gameserver.model.L2Spawn.doSpawn(L2Spawn.java:328)
        at net.sf.l2j.gameserver.model.L2Spawn.init(L2Spawn.java:309)
        at net.sf.l2j.gameserver.SpawnTable.fillSpawnTable(SpawnTable.java:139)
        at net.sf.l2j.gameserver.SpawnTable.<init>(SpawnTable.java:101)
        at net.sf.l2j.gameserver.SpawnTable.getInstance(SpawnTable.java:95)
        at net.sf.l2j.gameserver.GameServer.<init>(GameServer.java:430)
        at net.sf.l2j.Server.main(Server.java:62)