Citizens2 and sentry error

2013-01-29 20:39:39 [INFO] Gam3R3ap3r issued server command: /npc create Spawn Guard --at -132:1533:69:world --trait sentry
2013-01-29 20:39:39 [SEVERE] java.lang.NoSuchFieldError: bukkitEntity
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.npc.entity.EntityHumanNPC.getBukkitEntity(EntityHumanNPC.java:88)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.npc.entity.HumanController.createEntity(HumanController.java:24)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.npc.AbstractEntityController.spawn(AbstractEntityController.java:28)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.java:174)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.command.command.NPCCommands.create(NPCCommands.java:380)
2013-01-29 20:39:39 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-01-29 20:39:39 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-01-29 20:39:39 [SEVERE] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-01-29 20:39:39 [SEVERE] at java.lang.reflect.Method.invoke(Unknown Source)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.api.command.CommandManager.executeMethod(CommandManager.java:128)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.api.command.CommandManager.execute(CommandManager.java:83)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.api.command.CommandManager.executeSafe(CommandManager.java:152)
2013-01-29 20:39:39 [SEVERE] at net.citizensnpcs.Citizens.onCommand(Citizens.java:158)
2013-01-29 20:39:39 [SEVERE] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
2013-01-29 20:39:39 [SEVERE] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
2013-01-29 20:39:39 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.CraftServer.dispatchCommand(CraftServer.java:514)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.PlayerConnection.handleCommand(PlayerConnection.java:979)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.PlayerConnection.chat(PlayerConnection.java:897)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java:852)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.Packet3Chat.handle(Packet3Chat.java:44)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.NetworkManager.b(NetworkManager.java:290)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.PlayerConnection.d(PlayerConnection.java:112)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.ServerConnection.b(SourceFile:39)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServerConnection.b(SourceFile:30)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:598)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
2013-01-29 20:39:39 [SEVERE] at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)