17:58:33 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'trader' in plugin DtlCitizensTrader v2.4.0
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.dispatchCommand(CraftServer.java:514)
	at net.minecraft.server.v1_4_R1.PlayerConnection.handleCommand(PlayerConnection.java:979)
	at net.minecraft.server.v1_4_R1.PlayerConnection.chat(PlayerConnection.java:897)
	at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java:852)
	at net.minecraft.server.v1_4_R1.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.v1_4_R1.NetworkManager.b(NetworkManager.java:290)
	at net.minecraft.server.v1_4_R1.PlayerConnection.d(PlayerConnection.java:112)
	at net.minecraft.server.v1_4_R1.ServerConnection.b(SourceFile:39)
	at net.minecraft.server.v1_4_R1.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:598)
	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NoSuchFieldError: bukkitEntity
	at net.citizensnpcs.npc.entity.EntityHumanNPC.getBukkitEntity(EntityHumanNPC.java:87)
	at net.citizensnpcs.npc.entity.HumanController.createEntity(HumanController.java:24)
	at net.citizensnpcs.npc.AbstractEntityController.spawn(AbstractEntityController.java:28)
	at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.java:170)
	at net.dtl.citizens.trader.TraderCommandExecutor.createTrader(TraderCommandExecutor.java:931)
	at net.dtl.citizens.trader.TraderCommandExecutor.onCommand(TraderCommandExecutor.java:112)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	... 15 more