Estoy armando un server 1.7.10 bukkit y cuando un player envia un msj se muestra este error en la consola

Código:
[17:17:00 ERROR]: Could not pass event AsyncPlayerChatEvent to ChatManager v4.3
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:483) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.PlayerConnection.chat(PlayerConnection.j
ava:882) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java
:832) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java
:28) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat
.java:47) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:84)
 [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.server.v1_7_R4.NetworkManager.channelRead0(NetworkManag
er.java:204) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks
]
        at net.minecraft.util.io.netty.channel.SimpleChannelInboundHandler.chann
elRead(SimpleChannelInboundHandler.java:98) [craftbukkit-1.7.10.jar:git-Bukkit-1
.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invo
keChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit-1.7.10.jar:git
-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fire
ChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit-1.7.10.jar:git-B
ukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channe
lRead(ByteToMessageDecoder.java:173) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0
.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invo
keChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit-1.7.10.jar:git
-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fire
ChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit-1.7.10.jar:git-B
ukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channe
lRead(ByteToMessageDecoder.java:173) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0
.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invo
keChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit-1.7.10.jar:git
-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fire
ChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit-1.7.10.jar:git-B
ukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.handler.timeout.ReadTimeoutHandler.channe
lRead(ReadTimeoutHandler.java:149) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2
-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invo
keChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit-1.7.10.jar:git
-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fire
ChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit-1.7.10.jar:git-B
ukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.DefaultChannelPipeline.fireChanne
lRead(DefaultChannelPipeline.java:785) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-
R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.nio.AbstractNioByteChannel$NioByt
eUnsafe.read(AbstractNioByteChannel.java:100) [craftbukkit-1.7.10.jar:git-Bukkit
-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedK
ey(NioEventLoop.java:480) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6df
fcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedK
eysOptimized(NioEventLoop.java:447) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.
2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.channel.nio.NioEventLoop.run(NioEventLoop
.java:341) [craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at net.minecraft.util.io.netty.util.concurrent.SingleThreadEventExecutor
$2.run(SingleThreadEventExecutor.java:101) [craftbukkit-1.7.10.jar:git-Bukkit-1.
7.9-R0.2-13-gf6dffcf-b3102jnks]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_40]
Caused by: java.lang.NoClassDefFoundError: net/milkbowl/vault/economy/Economy
        at net.minefactory.chatmanager.ChatListener.onNickChat(ChatListener.java
:52) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_40]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_40]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_40]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        ... 28 more
Caused by: java.lang.ClassNotFoundException: net.milkbowl.vault.economy.Economy
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_40]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:77) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:62) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_40]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_40]
        at net.minefactory.chatmanager.ChatListener.onNickChat(ChatListener.java
:52) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_40]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_40]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_40]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit-1.7.10.jar:git-Bukkit-1.7.9-R0.2-13-gf6dffcf-b3102jnks]
        ... 28 more
[17:17:00 INFO]: <ImFranQ> mensaje