22:06:15 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'npc' in plugin Citizens v1.0.8
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:128)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:281)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:718)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:684)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:677)
	at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:32)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:217)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:75)
	at net.minecraft.server.NetworkListenThread.a(SourceFile:105)
	at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:401)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:311)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
Caused by: java.lang.NoSuchMethodError: net.minecraft.server.ItemInWorldManager.<init>(Lnet/minecraft/server/World;)V
	at com.fullwall.resources.redecouverte.NPClib.NPCSpawner.SpawnBasicHumanNpc(NPCSpawner.java:66)
	at com.fullwall.Citizens.NPCs.NPCManager.register(NPCManager.java:62)
	at com.fullwall.Citizens.NPCs.NPCManager.register(NPCManager.java:98)
	at com.fullwall.Citizens.Commands.CommandExecutors.BasicExecutor.create(BasicExecutor.java:522)
	at com.fullwall.Citizens.Commands.CommandExecutors.BasicExecutor.onCommand(BasicExecutor.java:51)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
	... 12 more