Error When Starting server :NPC

[antares]

2005-7-27 18:53:46 net.sf.l2j.gameserver.model.L2Spawn doSpawn
WARNING: NPC class not found
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at net.sf.l2j.gameserver.model.L2Spawn.doSpawn(L2Spawn.java:298)
at net.sf.l2j.gameserver.model.L2Spawn.init(L2Spawn.java:268)
at net.sf.l2j.gameserver.SpawnTable.fillSpawnTable(SpawnTable.java:113)
at net.sf.l2j.gameserver.SpawnTable.<init>(SpawnTable.java:56)
at net.sf.l2j.gameserver.SpawnTable.<clinit>(SpawnTable.java:43)
at net.sf.l2j.gameserver.GameServer.<init>(GameServer.java:270)
at net.sf.l2j.Server.main(Server.java:73)
Caused by: java.lang.NullPointerException
at net.sf.l2j.gameserver.IdFactory.setObjectIDAsUsed(IdFactory.java:270)
at net.sf.l2j.gameserver.model.L2Object.<init>(L2Object.java:67)
at net.sf.l2j.gameserver.model.L2Character.<init>(L2Character.java:410)
at net.sf.l2j.gameserver.model.L2NpcInstance.<init>(L2NpcInstance.java:77)
... 10 more



and so and so.... its repeating

[MentaL]

[antares]

someone??????