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Whenever I try to go on a server I get this:
[spoiler]
Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception in world tick

A full error report has been saved to C:\Documents and Settings\What\Application Data\.minecraft\crash-reports\crash-2012-11-21_20.03.27-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT c8a5ceef --------
Full report at:
C:\Documents and Settings\What\Application Data\.minecraft\crash-reports\crash-2012-11-21_20.03.27-client.txt
Please show that file to Mojang, NOT just this screen!---- Minecraft Crash Report ----
// You're mean.

Time: 11/21/12 8:03 PM
Description: Exception in world tick

java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at zs.a(SourceFile:820)
at axz.a(SourceFile:851)
at du.a(SourceFile:135)
at cg.b(SourceFile:349)
at axz.d(SourceFile:80)
at ayh.b(SourceFile:62)
at net.minecraft.client.Minecraft.l(SourceFile:1331)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at java.lang.System.arraycopy(Native Method)
at zs.a(SourceFile:820)
at axz.a(SourceFile:851)
at du.a(SourceFile:135)
at cg.b(SourceFile:349)
at axz.d(SourceFile:80)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ayk['smattymatty'/1964, l='MpServer', x=42.53, y=69.42, z=227.64]]
Chunk stats: MultiplayerChunkCache: 18
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (104,64,256), Chunk: (at 8,4,0 in 6,16; contains blocks 96,0,256 to 111,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 13035973 game time, 2648471 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 11 total; [ayk['smattymatty'/1964, l='MpServer', x=42.53, y=69.42, z=227.64], qc['Creeper'/1629, l='MpServer', x=59.50, y=36.00, z=239.50], qc['Creeper'/1628, l='MpServer', x=57.50, y=36.00, z=241.50], qc['Creeper'/1631, l='MpServer', x=49.94, y=37.00, z=241.41], qc['Creeper'/1630, l='MpServer', x=55.50, y=36.00, z=241.50], ow['Bat'/384, l='MpServer', x=47.66, y=34.09, z=224.25], qc['Creeper'/778, l='MpServer', x=76.50, y=50.00, z=242.50], qn['Skeleton'/121, l='MpServer', x=66.50, y=56.00, z=253.94], qr['Zombie'/105, l='MpServer', x=56.50, y=53.00, z=258.50], qr['Zombie'/777, l='MpServer', x=79.03, y=51.00, z=237.50], qr['Zombie'/90, l='MpServer', x=33.69, y=42.00, z=227.56]]
Retry entities: 0 total; []
Stacktrace:
at ayh.a(SourceFile:290)
at net.minecraft.client.Minecraft.l(SourceFile:1338)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ayk['smattymatty'/1964, l='MpServer', x=42.53, y=69.42, z=227.64]]
Chunk stats: MultiplayerChunkCache: 18
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (104,64,256), Chunk: (at 8,4,0 in 6,16; contains blocks 96,0,256 to 111,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 13035973 game time, 2648471 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 11 total; [ayk['smattymatty'/1964, l='MpServer', x=42.53, y=69.42, z=227.64], qc['Creeper'/1629, l='MpServer', x=59.50, y=36.00, z=239.50], qc['Creeper'/1628, l='MpServer', x=57.50, y=36.00, z=241.50], qc['Creeper'/1631, l='MpServer', x=49.94, y=37.00, z=241.41], qc['Creeper'/1630, l='MpServer', x=55.50, y=36.00, z=241.50], ow['Bat'/384, l='MpServer', x=47.66, y=34.09, z=224.25], qc['Creeper'/778, l='MpServer', x=76.50, y=50.00, z=242.50], qn['Skeleton'/121, l='MpServer', x=66.50, y=56.00, z=253.94], qr['Zombie'/105, l='MpServer', x=56.50, y=53.00, z=258.50], qr['Zombie'/777, l='MpServer', x=79.03, y=51.00, z=237.50], qr['Zombie'/90, l='MpServer', x=33.69, y=42.00, z=227.56]]
Retry entities: 0 total; []

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 437522176 bytes (417 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 13 (728 bytes; 0 MB) allocated, 13 (728 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdaterSmooth, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 71
LWJGL: 2.4.2
OpenGL: RADEON 9200 Series DDR x86/SSE2 GL version 1.3.1072 WinXP Release, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Delightful.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: 31 (1736 bytes; 0 MB) allocated, 15 (840 bytes; 0 MB) used

oops

I'm not sure, I get the same problem. Any help somebody? =S

Help?