Entity is already tracked! Error.

Between the following error and "Can't keep up" errors, I've tried removing all my plugins and slowly added one at a time. I haven't had the Entity error for the last few days, but usually if the server begins to have some lagg issues, this usually shows up.

Code:

2011-04-19 17:31:12 [WARNING] Failed to handle packet: java.lang.IllegalStateException: Entity is already tracked!
java.lang.IllegalStateException: Entity is already tracked!
    at net.minecraft.server.EntityTracker.a(EntityTracker.java:72)
    at net.minecraft.server.EntityTracker.a(EntityTracker.java:62)
    at net.minecraft.server.EntityTracker.a(EntityTracker.java:51)
    at net.minecraft.server.WorldManager.a(WorldManager.java:17)
    at net.minecraft.server.World.b(World.java:750)
    at net.minecraft.server.WorldServer.b(WorldServer.java:94)
    at net.minecraft.server.World.a(World.java:1590)
    at net.minecraft.server.Chunk.d(Chunk.java:470)
    at net.minecraft.server.ChunkProviderServer.c(ChunkProviderServer.java:75)
    at net.minecraft.server.PlayerInstance.<init>(PlayerInstance.java:33)
    at net.minecraft.server.PlayerManager.a(PlayerManager.java:37)
    at net.minecraft.server.PlayerManager.a(PlayerManager.java:76)
    at net.minecraft.server.ServerConfigurationManager.a(ServerConfigurationManager.java:106)
    at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:87)
    at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:27)
    at net.minecraft.server.NetworkListenThread.a(SourceFile:87)
    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:368)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:283)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:375)

Plugins:

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rTriggers 1.3
iConomy 4.64
BigBrother 1.8-SNAPSHOT
NaturalGiants 1.1
Unknown Command 1.3
TimeAnnounce 1.1
RemoteToolkitPlugin 0.31b
Commands Logging 0.1
iChat 2.2.2
LWC 2.3
Jail 0.5.6
SpyerAdmin 0.81
xWarp 2.9.0
milkAdmin 2.6-03.30
MobBounty 2.01
SignColours 0.3
Landmarks 0.1
TelePlusPlus 1.3.3
PvP Control 1.5
Towny 0.61
dynmap 0.15
Permissions 2.7
BlastControl 1.0.4
MinecartManiaCore 1.09c
SignColours 0.3
Factions 1.1.4
MobileAdmin 2.4.1
iConomyChestShop 2.3
Turnstile 1.5
Tombstone 1.2.3
Stats 0.985
CommandBook 1.2.1-customized
MultiVerse 1.6.2
MinecartManiaAutomations 1.09
Achievements 0.981

 

@Liger_XT5 Just as i thought, your issue is same as mine was, natural giants does it, remove it untill its fixed.

 

@KrazyBonez
Thanks! I'll remove it and see if the error pops up again in the next few days. I liked the plugin, though I only set it to 1% change, 650 health, fire off, and left the drop as is. Kept "Boss battles" entertaining lol. The fire just seemed annoying. Be better if is shot lasers (ok, arrows would be a better term). LOL Just a funny thought.