Java I/O exception error

So, im geting this error many times on my server, it usually dont do anything, but sometimes it breaks the server. Can anyone help me get rid of this thing?

Error:
2011-02-24 14:53:15 [SEVERE] java.util.ConcurrentModificationException 2011-02-24 14:53:15 [SEVERE] at java.util.HashMap$HashIterator.nextEntry(HashMap.java:848) 2011-02-24 14:53:15 [SEVERE] at java.util.HashMap$KeyIterator.next(HashMap.java:883) 2011-02-24 14:53:15 [SEVERE] at net.minecraft.server.EntityTracker.a(EntityTracker.java:106) 2011-02-24 14:53:15 [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:340) 2011-02-24 14:53:15 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:253) 2011-02-24 14:53:15 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:366) 2011-02-24 14:53:15 [SEVERE] Unexpected exception java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:848) at java.util.HashMap$KeyIterator.next(HashMap.java:883) at net.minecraft.server.EntityTracker.a(EntityTracker.java:106) at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:340) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:253) at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
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Os: CentOS x64
Java: Sun java x64
Craftbukkit 432


ls of my plugin folder:
AnjoSecurity EssentialsHome.jar SignColours.jar
AnjoSecurity.jar EssentialsSpawn.jar Spells.jar
AntiGrief EssentialsTele.jar Superheat.jar
AntiGrief.jar EssentialsWarp.jar Vanish
Authorize FakePermissions.jar Vanish.jar
BigBrother Flashlight v1-0-3.jar Wand.jar
BigBrother.jar GroupManager WorldEdit
BoatBoost.jar GroupManager.jar WorldEdit.jar
CHANGELOG.txt HeroicDeath WorldGuard
CavernasSiteToolkit.jar HeroicDeath.jar WorldGuard.jar
ChestTrap.jar Lockette bFlight.jar
ChickenBombs.jar Lockette.jar craftscripts
CraftIRC.jar MonsterHunt folder
CraftIRC.settings~ MonsterTamer iAuction
CrowdControl.jar MonsterTamer.jar iAuction.jar
Elevators NameChecker iChat
Elevators.jar NameChecker.jar iChat.jar
Essentials Permissions iConomy.jar
Essentials.jar Persistence iConomyChestShop
EssentialsBan.jar Persistence.jar iConomyChestShop.jar
EssentialsHelp.jar RegexFilter iWatch
EssentialsHome RegexFilter.jar

but I dont think it is plugin error, it usually is diferent when a plugin gives an error. But anyway, I know nothing of java, im just guessing.

Can anyone help plox?

 

Yeh, I am getting the exact same problem.

Have no clue what it is.

 

BUMP. This is bringing us to our knees once a day.

Code:

2011-03-09 08:19:24 [SEVERE] Unexpected exception
java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
    at java.util.HashMap$KeyIterator.next(HashMap.java:845)
    at net.minecraft.server.EntityTracker.a(EntityTracker.java:106)
    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:353)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:266)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)

 

Remove all your plugins and you'll find out pretty quickly if its a problem with one of them.