Help! Ubuntu Strange Java Exceptions

Hi there,
I just moved to a new Ubuntu- based server. I took everything off my old server (Debian) and put it onto the new one. It started like always, but I keep getting those errors:

Code:

20:27:27 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 928, Size: 900
20:27:27 [SEVERE]       at java.util.ArrayList.RangeCheck(ArrayList.java:547)
20:27:27 [SEVERE]       at java.util.ArrayList.set(ArrayList.java:337)
20:27:27 [SEVERE]       at net.minecraft.server.RegionFile.a(SourceFile:285)
20:27:27 [SEVERE]       at net.minecraft.server.ChunkBuffer.close(SourceFile:259)
20:27:27 [SEVERE]       at java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:149)
20:27:27 [SEVERE]       at java.io.FilterOutputStream.close(FilterOutputStream.java:143)
20:27:27 [SEVERE]       at net.minecraft.server.ChunkRegionLoader.a(SourceFile:64)
20:27:27 [SEVERE]       at net.minecraft.server.ChunkProviderServer.saveChunk(ChunkProviderServer.java:168)
20:27:27 [SEVERE]       at net.minecraft.server.ChunkProviderServer.saveChunks(ChunkProviderServer.java:216)
20:27:27 [SEVERE]       at net.minecraft.server.World.save(World.java:206)
20:27:27 [SEVERE]       at net.minecraft.server.World.doTick(World.java:1636)
20:27:27 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:423)
20:27:27 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:343)
20:27:27 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

WHAT is this? Is my main world "world" maybe corrupted? The errors also happen when every player is in another world, though. Should I just reupload the world- files from my backup?

Build 690, unmodded client.
Plugins:
CommandSigns, FalseBookCart, ColoredSigns, AlwaysDay, LimitSpawns, ChairCraft, Tables, FalseBookChat, BlockCantKeepUpSpam, MineMail, BiomeMessage, ColorMe, FalseBookCore, FakeMessage, MinecartManiaCore, FalseBookIC, SpawnX, SimpleGive, HeroicDeath, FalseBookBlock, MusicCraft, ScrapBukkit, VanishNoPickup, RedstoneMobSpawn, BigBrother, ChatBukkit, MultiInv, FalseBookExtra, WorldGuard, Warpz0r, SuperJump, iConomyChestShop, MoveCraft, MagicCarpet, HomeSweetHome, LoginMessage, WorldEdit, Lockette, Permissions, NextStation, iConomy, MultiVerse, MobArena, ThunderJoin, CookieMonster, Citizens
(there weren't any errors before the move on the new server so I do not think it's a plugin- problem)

EDIT.: I just reuploaded it, seems to have fixed it... I feel a little dumb now that I created this thread.