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My Multiplayer modded 1.6.4 server keeps on crashing and I don't understand why it is crashing. I can't figure out what the problem is...---- Minecraft Crash Report ----
// I let you down. Sorry

Time: 3/2/14 4:50 PM
Description: Ticking screen

java.lang.IllegalStateException: Server tried to update attributes of a non-living entity (actually: DeadIrukandji['entity.DeadIrukandji.name'/520, l='MpServer', x=-47.69, y=67.00, z=250.84])
at net.minecraft.client.multiplayer.NetClientHandler.func_110773_a(NetClientHandler.java:1829)
at net.minecraft.network.packet.Packet44UpdateAttributes.func_73279_a(SourceFile:68)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1580)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

I can't get on the world at all.