Can't spawn NPCs with Citizens

Everytime I try to spawn NPCs, I get this error:

Code:

12:24:52 [INFO] PsiHovno issued server command: /npc create test
12:24:56 [INFO] [Citizens] Could not fetch NMS field e: e.
12:24:56 [INFO] [Citizens] Could not fetch NMS field j: j.
12:24:56 [INFO] [Citizens] Could not fetch NMS field m: m.
12:24:57 [INFO] [Citizens] Could not fetch NMS field e: e.
12:24:57 [INFO] [Citizens] Could not fetch NMS field j: j.
12:24:57 [INFO] [Citizens] Could not fetch NMS field m: m.
12:24:58 [SEVERE] Reached end of stream for null
12:24:58 [SEVERE] java.lang.NoSuchMethodError: net.citizensnpcs.npc.entity.Entit
yHumanNPC.getAttributeInstance(Lnet/minecraft/entity/ai/attributes/Attribute;)Ln
et/minecraft/entity/ai/attributes/AttributeInstance;
12:24:58 [SEVERE]      at net.citizensnpcs.util.nms.PlayerNavigation.<init>(Pla
yerNavigation.java:37)
12:24:58 [SEVERE]      at net.citizensnpcs.npc.entity.EntityHumanNPC.initialise
(EntityHumanNPC.java:156)
12:24:58 [SEVERE]      at net.citizensnpcs.npc.entity.EntityHumanNPC.<init>(Ent
ityHumanNPC.java:68)
12:24:58 [SEVERE]      at net.citizensnpcs.npc.entity.HumanController.createEnt
ity(HumanController.java:22)
12:24:58 [SEVERE]      at net.citizensnpcs.npc.AbstractEntityController.spawn(A
bstractEntityController.java:28)
12:24:58 [SEVERE]      at net.citizensnpcs.npc.CitizensNPC.spawn(CitizensNPC.ja
va:187)
12:24:58 [SEVERE]      at net.citizensnpcs.commands.NPCCommands.create(NPCComma
nds.java:345)
12:24:58 [SEVERE]      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native M
ethod)
12:24:58 [SEVERE]      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown S
ource)
12:24:58 [SEVERE]      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unkno
wn Source)
12:24:58 [SEVERE]      at java.lang.reflect.Method.invoke(Unknown Source)
12:24:58 [SEVERE]      at net.citizensnpcs.api.command.CommandManager.executeMe
thod(CommandManager.java:131)
12:24:58 [SEVERE]      at net.citizensnpcs.api.command.CommandManager.execute(C
ommandManager.java:86)
12:24:58 [SEVERE]      at net.citizensnpcs.api.command.CommandManager.executeSa
fe(CommandManager.java:155)
12:24:58 [SEVERE]      at net.citizensnpcs.Citizens.onCommand(Citizens.java:214
)
12:24:58 [SEVERE]      at org.bukkit.command.PluginCommand.execute(PluginComman
d.java:44)
12:24:58 [SEVERE]      at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCo
mmandMap.java:189)
12:24:58 [SEVERE]      at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCo
mmand(CraftServer.java:564)
12:24:58 [SEVERE]      at net.minecraft.network.NetServerHandler.func_72566_d(N
etServerHandler.java:1390)
12:24:58 [SEVERE]      at net.minecraft.network.NetServerHandler.chat(NetServer
Handler.java:1256)
12:24:58 [SEVERE]      at net.minecraft.network.NetServerHandler.func_72481_a(N
etServerHandler.java:1182)
12:24:58 [SEVERE]      at net.minecraft.network.packet.Packet3Chat.func_73279_a
(Packet3Chat.java:68)
12:24:58 [SEVERE]      at net.minecraft.network.TcpConnection.func_74428_b(TcpC
onnection.java:464)
12:24:58 [SEVERE]      at net.minecraft.network.NetServerHandler.func_72570_d(N
etServerHandler.java:230)
12:24:58 [SEVERE]      at net.minecraft.network.NetworkListenThread.func_71747_
b(NetworkListenThread.java:54)
12:24:58 [SEVERE]      at net.minecraft.server.dedicated.DedicatedServerListenT
hread.func_71747_b(DedicatedServerListenThread.java:34)
12:24:58 [SEVERE]      at net.minecraft.server.MinecraftServer.func_71190_q(Min
ecraftServer.java:872)
12:24:58 [SEVERE]      at net.minecraft.server.dedicated.DedicatedServer.func_7
1190_q(DedicatedServer.java:318)
12:24:58 [SEVERE]      at net.minecraft.server.MinecraftServer.func_71217_p(Min
ecraftServer.java:741)
12:24:58 [SEVERE]      at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:625)
12:24:58 [SEVERE]      at net.minecraft.server.ThreadMinecraftServer.run(Thread
MinecraftServer.java:16)

In addition, when I run the server, I can see that "Could not fetch NMS field " error in the console.
I'm using Vault and the latest Citizens build (alpha 3) for 1.6.2.
Please, give me a hand on this!

 

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