[19:20:53 ERROR]: Could not pass event PlayerDeathEvent to KitPvP v2.1
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[spigot.jar:git-Spigot-1376]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1376]
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[spigot.jar:git-Spigot-1376]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1376]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1376]
    at org.bukkit.craftbukkit.v1_7_R2.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:366) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.EntityPlayer.die(EntityPlayer.java:389) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.EntityLiving.damageEntity(EntityLiving.java:739) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.EntityHuman.damageEntity(EntityHuman.java:751) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.EntityPlayer.damageEntity(EntityPlayer.java:468) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.EntityHuman.attack(EntityHuman.java:923) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.PlayerConnection.a(PlayerConnection.java:1144) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.PacketPlayInUseEntity.a(SourceFile:55) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.PacketPlayInUseEntity.handle(SourceFile:10) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.NetworkManager.a(NetworkManager.java:148) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.ServerConnection.c(ServerConnection.java:77) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:703) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:273) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:566) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:472) [spigot.jar:git-Spigot-1376]
    at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [spigot.jar:git-Spigot-1376]
Caused by: java.lang.NoClassDefFoundError: net/milkbowl/vault/economy/Economy
    at me.oliver276.kitpvp.Main.onPlayerDeath(Main.java:720) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[spigot.jar:git-Spigot-1376]
    ... 20 more
Caused by: java.lang.ClassNotFoundException: net.milkbowl.vault.economy.Economy
    at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_51]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_51]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_51]
    at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[spigot.jar:git-Spigot-1376]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[spigot.jar:git-Spigot-1376]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_51]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_51]
    at me.oliver276.kitpvp.Main.onPlayerDeath(Main.java:720) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[spigot.jar:git-Spigot-1376]
    ... 20 more