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Help! When ever i try to log into a server it gives me this error message:


---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 12/12/12 12:26 PM
Description: Ticking screen

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 ayc.c(SourceFile:69)
at net.minecraft.client.Minecraft.l(SourceFile:1112)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Thread.java:680)


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)
at ayc.c(SourceFile:69)

-- Affected screen --
Details:
Screen name: ~~ERROR~~ NullPointerException: null

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ayk['DontFallItHurtss'/130, l='MpServer', x=138.14, y=65.62, z=617.61]]
Chunk stats: MultiplayerChunkCache: 2
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (102,66,656), Chunk: (at 6,4,0 in 6,41; contains blocks 96,0,656 to 111,255,671), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Level time: 3171633 game time, 3285295 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 1 total; [ayk['DontFallItHurtss'/130, l='MpServer', x=138.14, y=65.62, z=617.61]]
Retry entities: 0 total; []
Stacktrace:
at ayh.a(SourceFile:290)
at net.minecraft.client.Minecraft.b(SourceFile:1870)
at net.minecraft.client.Minecraft.run(SourceFile:543)
at java.lang.Thread.run(Thread.java:680)

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Mac OS X (x86_64) version 10.8.2
Java Version: 1.6.0_37, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 540111168 bytes (515 MB) / 581435392 bytes (554 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 10817 (605752 bytes; 0 MB) allocated, 10817 (605752 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel HD Graphics 4000 OpenGL Engine GL version 2.1 APPLE-8.0.61, Intel Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

how?