Problème plugin trader

[thevivi84]

Bonjour, j'au un problème avec le plugin trader : quand je tente de créer un trader avec "/trader create vir", rien ne se passe et la console de commande écrit
[20:26:01 INFO]: thevivi84 issued server command: /trader create vir
[20:26:01 WARN]: DataWatcher ID conflict for player:[unknown] @ 26
[20:26:01 WARN]: DataWatcher ID conflict for player:[unknown] @ 27
[20:26:01 WARN]: DataWatcher ID conflict for player:[unknown] @ 28
[20:26:01 WARN]: java.lang.reflect.InvocationTargetException
[20:26:01 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native M
ethod)
[20:26:01 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown S
ource)
[20:26:01 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unkno
wn Source)
[20:26:01 WARN]: at java.lang.reflect.Method.invoke(Unknown Source)
[20:26:01 WARN]: at net.dandielo.citizens.traders_v3.core.commands.Comman
dManager$CommandBinding.execute(CommandManager.java:303)
[20:26:01 WARN]: at net.dandielo.citizens.traders_v3.core.commands.Comman
dManager.execute(CommandManager.java:142)
[20:26:01 WARN]: at net.dandielo.citizens.traders_v3.core.commands.DtlCom
mandExecutor.onCommand(DtlCommandExecutor.java:31)
[20:26:01 WARN]: at org.bukkit.command.PluginCommand.execute(PluginComman
d.java:44)
[20:26:01 WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCo
mmandMap.java:175)
[20:26:01 WARN]: at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCo
mmand(CraftServer.java:648)
[20:26:01 WARN]: at net.minecraft.network.NetHandlerPlayServer.func_14736
1_d(NetHandlerPlayServer.java:1345)
[20:26:01 WARN]: at net.minecraft.network.NetHandlerPlayServer.func_14735
4_a(NetHandlerPlayServer.java:1127)
[20:26:01 WARN]: at net.minecraft.network.play.client.C01PacketChatMessag
e.func_148833_a(C01PacketChatMessage.java:38)
[20:26:01 WARN]: at net.minecraft.network.play.client.C01PacketChatMessag
e.func_148833_a(C01PacketChatMessage.java:53)
[20:26:01 WARN]: at net.minecraft.network.NetworkManager.func_74428_b(Net
workManager.java:206)
[20:26:01 WARN]: at net.minecraft.network.NetworkSystem.func_151269_c(Net
workSystem.java:173)
[20:26:01 WARN]: at net.minecraft.server.MinecraftServer.func_71190_q(Min
ecraftServer.java:953)
[20:26:01 WARN]: at net.minecraft.server.dedicated.DedicatedServer.func_7
1190_q(DedicatedServer.java:432)
[20:26:01 WARN]: at net.minecraft.server.MinecraftServer.func_71217_p(Min
ecraftServer.java:783)
[20:26:01 WARN]: at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:646)
[20:26:01 WARN]: at java.lang.Thread.run(Unknown Source)
[20:26:01 WARN]: Caused by: java.lang.IllegalAccessError: tried to access field
net.minecraft.pathfinding.PathNavigate.field_75521_i from class net.citizensnpcs
.util.nms.PlayerNavigation
[20:26:01 WARN]: at net.citizensnpcs.util.nms.PlayerNavigation.<init>(Pla
yerNavigation.java:27)
[20:26:01 WARN]: at net.citizensnpcs.npc.entity.EntityHumanNPC.initialise
(EntityHumanNPC.java:215)
[20:26:01 WARN]: at net.citizensnpcs.npc.entity.EntityHumanNPC.<init>(Ent
ityHumanNPC.java:65)
[20:26:01 WARN]: at net.citizensnpcs.npc.entity.HumanController.createEnt
ity(HumanController.java:29)
[20:26:01 WARN]: at net.citizensnpcs.npc.AbstractEntityController.spawn(A
bstractEntityController.java:36)
[20:26:01 WARN]: at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.ja
va:161)
[20:26:01 WARN]: at net.dandielo.citizens.traders_v3.bukkit.commands.Trad
erCommands.traderCreate(TraderCommands.java:96)
[20:26:01 WARN]: ... 21 more