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Les logs :
2013-11-26 18:45:04 [INFO] Loading Player: amiralZ
2013-11-26 18:45:04 [INFO] Sending serverside check to: amiralZ
2013-11-26 18:45:13 [INFO] amiralZ issued server command: /npc create test
2013-11-26 18:45:13 [INFO] [Citizens] Could not fetch NMS field e: e.
2013-11-26 18:45:13 [INFO] [Citizens] Could not fetch NMS field j: j.
2013-11-26 18:45:13 [INFO] [Citizens] Could not fetch NMS field m: m.
2013-11-26 18:45:13 [SEVERE] java.lang.NoSuchFieldError: field_75515_a
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.util.nms.PlayerNavigation.<init>(PlayerNavigation.java:35)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.npc.entity.EntityHumanNPC.initialise(EntityHumanNPC.java:154)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.npc.entity.EntityHumanNPC.<init>(EntityHumanNPC.java:66)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.npc.entity.HumanController.createEntity(HumanController.java:22)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.npc.AbstractEntityController.spawn(AbstractEntityController.java:28)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.java:150)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.commands.NPCCommands.create(NPCCommands.java:352)
2013-11-26 18:45:13 [SEVERE]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-11-26 18:45:13 [SEVERE]at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-11-26 18:45:13 [SEVERE]at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-11-26 18:45:13 [SEVERE]at java.lang.reflect.Method.invoke(Unknown Source)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.api.command.CommandManager.executeMethod(CommandManager.java:153)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.api.command.CommandManager.execute(CommandManager.java:90)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.api.command.CommandManager.executeSafe(CommandManager.java:177)
2013-11-26 18:45:13 [SEVERE]at net.citizensnpcs.Citizens.onCommand(Citizens.java:214)
2013-11-26 18:45:13 [SEVERE]at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
2013-11-26 18:45:13 [SEVERE]at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
2013-11-26 18:45:13 [SEVERE]at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:532)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.NetServerHandler.func_72566_d(NetServerHandler.java:1389)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.NetServerHandler.chat(NetServerHandler.java:1253)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.NetServerHandler.func_72481_a(NetServerHandler.java:1185)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.packet.Packet3Chat.func_73279_a(Packet3Chat.java:68)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:470)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:233)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:34)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:913)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:327)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:780)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662)
2013-11-26 18:45:13 [SEVERE]at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)