Plugin Bug avec Citizens 2

[lucas-5201]

Bonjour,
j'installe Citizens 2 sur mon serveur mais quand je fais /npc create pseudo sa me dit
Merci de rapporter cette erreur
Voici l'erreur en question:

Spoiler

[12:34:48 WARN]: java.lang.IllegalAccessError: tried to access field net.minecra
ft.pathfinding.PathNavigate.field_75521_i from class net.citizensnpcs.util.nms.P
layerNavigation
[12:34:48 WARN]: at net.citizensnpcs.util.nms.PlayerNavigation.<init>(Pla
yerNavigation.java:27)
[12:34:48 WARN]: at net.citizensnpcs.npc.entity.EntityHumanNPC.initialise
(EntityHumanNPC.java:214)
[12:34:48 WARN]: at net.citizensnpcs.npc.entity.EntityHumanNPC.<init>(Ent
ityHumanNPC.java:64)
[12:34:48 WARN]: at net.citizensnpcs.npc.entity.HumanController.createEnt
ity(HumanController.java:29)
[12:34:48 WARN]: at net.citizensnpcs.npc.AbstractEntityController.spawn(A
bstractEntityController.java:36)
[12:34:48 WARN]: at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.ja
va:162)
[12:34:48 WARN]: at net.citizensnpcs.commands.NPCCommands.create(NPCComma
nds.java:363)
[12:34:48 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native M
ethod)
[12:34:48 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown S
ource)
[12:34:48 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unkno
wn Source)
[12:34:48 WARN]: at java.lang.reflect.Method.invoke(Unknown Source)
[12:34:48 WARN]: at net.citizensnpcs.api.command.CommandManager.executeMe
thod(CommandManager.java:153)
[12:34:48 WARN]: at net.citizensnpcs.api.command.CommandManager.execute(C
ommandManager.java:90)
[12:34:48 WARN]: at net.citizensnpcs.api.command.CommandManager.executeSa
fe(CommandManager.java:177)
[12:34:48 WARN]: at net.citizensnpcs.Citizens.onCommand(Citizens.java:236
)
[12:34:48 WARN]: at org.bukkit.command.PluginCommand.execute(PluginComman
d.java:44)
[12:34:48 WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCo
mmandMap.java:175)
[12:34:48 WARN]: at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCo
mmand(CraftServer.java:647)
[12:34:48 WARN]: at net.minecraft.network.NetHandlerPlayServer.func_14736
1_d(NetHandlerPlayServer.java:1345)
[12:34:48 WARN]: at net.minecraft.network.NetHandlerPlayServer.func_14735
4_a(NetHandlerPlayServer.java:1127)
[12:34:48 WARN]: at net.minecraft.network.play.client.C01PacketChatMessag
e.func_148833_a(C01PacketChatMessage.java:38)
[12:34:48 WARN]: at net.minecraft.network.play.client.C01PacketChatMessag
e.func_148833_a(C01PacketChatMessage.java:53)
[12:34:48 WARN]: at net.minecraft.network.NetworkManager.func_74428_b(Net
workManager.java:206)
[12:34:48 WARN]: at net.minecraft.network.NetworkSystem.func_151269_c(Net
workSystem.java:173)
[12:34:48 WARN]: at net.minecraft.server.MinecraftServer.func_71190_q(Min
ecraftServer.java:945)
[12:34:48 WARN]: at net.minecraft.server.dedicated.DedicatedServer.func_7
1190_q(DedicatedServer.java:432)
[12:34:48 WARN]: at net.minecraft.server.MinecraftServer.func_71217_p(Min
ecraftServer.java:775)
[12:34:48 WARN]: at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:638)
[12:34:48 WARN]: at java.lang.Thread.run(Unknown Source)

merci d'avoir lu et de m'aider