L2J Server

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L2J Revision 4420:
L2JDP Revision 7664:

When game server starts up and reach npc table, it gives me this error, what can it be so I can fixed.

Feb 12, 2012 6:26:29 AM com.l2jserver.gameserver.datatables.NpcTable restoreNpcData
SEVERE: NPCTable: Error creating NPC table.
java.lang.IllegalArgumentException: String value required, but not specified
at com.l2jserver.gameserver.templates.StatsSet.getString(StatsSet.java:375)
at com.l2jserver.gameserver.templates.chars.L2NpcTemplate.<init>(L2NpcTemplate.java:198)
at com.l2jserver.gameserver.datatables.NpcTable.fillNpcTable(NpcTable.java:552)
at com.l2jserver.gameserver.datatables.NpcTable.restoreNpcData(NpcTable.java:87)
at com.l2jserver.gameserver.datatables.NpcTable.<init>(NpcTable.java:65)
at com.l2jserver.gameserver.datatables.NpcTable.<init>(NpcTable.java:50)
at com.l2jserver.gameserver.datatables.NpcTable$SingletonHolder.<clinit>(NpcTable.java:806)
at com.l2jserver.gameserver.datatables.NpcTable.getInstance(NpcTable.java:58)
at com.l2jserver.gameserver.GameServer.<init>(GameServer.java:254)
at com.l2jserver.gameserver.GameServer.main(GameServer.java:490)

Thankx.

Atte.
Xion

The error says: String value required, but not specified