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Hello, my minecraft will not let me go on a server, instead it gives me a crash


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:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-17_10.44.12-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 fbf68ec7 --------
Full report at:
C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-17_10.44.12-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 11/17/12 10:44 AM

-- 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['fbjac01'/42700, l='MpServer', x=-296.50, y=33.62, z=245.50]]
Chunk stats: MultiplayerChunkCache: 64
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-1062,32,927), Chunk: (at 10,2,15 in -67,57; contains blocks -1072,0,912 to -1057,255,927), Region: (-3,1; contains chunks -96,32 to -65,63, blocks -1536,0,512 to -1025,255,1023)
Level time: 223182929 game time, 223958054 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['fbjac01'/42700, l='MpServer', x=-296.50, y=33.62, z=245.50]]
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['fbjac01'/42700, l='MpServer', x=-296.50, y=33.62, z=245.50]]
Chunk stats: MultiplayerChunkCache: 64
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-1062,32,927), Chunk: (at 10,2,15 in -67,57; contains blocks -1072,0,912 to -1057,255,927), Region: (-3,1; contains chunks -96,32 to -65,63, blocks -1536,0,512 to -1025,255,1023)
Level time: 223182929 game time, 223958054 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['fbjac01'/42700, l='MpServer', x=-296.50, y=33.62, z=245.50]]
Retry entities: 0 total; []

-- System Details --
Details:
Minecraft Version: 1.4.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_25, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 3935690640 bytes (3753 MB) / 4043702272 bytes (3856 MB) up to 4043702272 bytes (3856 MB)
JVM Flags: 2 total; -Xms4024M -Xmx4288M
AABB Pool Size: 21638 (1211728 bytes; 1 MB) allocated, 14 (784 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: RS880 GL version 3.2.9551 Compatibility Profile Context, ATI Technologies 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: 37 (2072 bytes; 0 MB) allocated, 21 (1176 bytes; 0 MB) used

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)
--- END ERROR REPORT 407cd92 ----------

i have no mods please help me