Bukkit

I have this error:
2013-05-20 17:38:55 [SEVERE] Could not pass event PlayerDeathEvent to MoneyDrop v2.1.1
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:340)
at net.minecraft.server.v1_5_R3.EntityPlayer.die(EntityPlayer.java:293)
at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:750)
at net.minecraft.server.v1_5_R3.EntityHuman.damageEntity(EntityHuman.java:684)
at net.minecraft.server.v1_5_R3.EntityPlayer.damageEntity(EntityPlayer.java:358)
at org.bukkit.craftbukkit.v1_5_R3.entity.CraftLivingEntity.damage(CraftLivingEntity.java:195)
at org.bukkit.craftbukkit.v1_5_R3.entity.CraftLivingEntity.damage(CraftLivingEntity.java:180)
at com.earth2me.essentials.commands.Commandkill.run(Commandkill.java:41)
at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:111)
at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:105)
at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:431)
at com.earth2me.essentials.Essentials.onCommand(Essentials.java:320)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:523)
at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:965)
at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
at me.drakespirit.plugins.moneydrop.EventListener.onPlayerDeath(EventListener.java:99)
at sun.reflect.GeneratedMethodAccessor580.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 31 more

I use the version 2.1.1 of the plugin and the version 2771 of bukkit :)

Try this. Looks like its calling a method that no longer exists.

Staff edit: Link removed.