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Hello, recently my minecraft has been crashing when I log onto either a multiplayer server, or just a single player world. It comes up with this error report.



---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 12/4/12 12:16 AM
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: 49023
at xr.a(SourceFile:14)
at yr.l(SourceFile:231)
at akm.b(SourceFile:79)
at baq.q(SourceFile:3547)
at baq.b(SourceFile:101)
at azy.a(SourceFile:160)
at bak.a(SourceFile:1126)
at bac.a(SourceFile:869)
at bac.b(SourceFile:751)
at net.minecraft.client.Minecraft.J(SourceFile:604)
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 xr.a(SourceFile:14)
at yr.l(SourceFile:231)
at akm.b(SourceFile:79)
at baq.q(SourceFile:3547)
at baq.b(SourceFile:101)
at azy.a(SourceFile:160)
at bak.a(SourceFile:1126)
at bac.a(SourceFile:869)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ayk['lawdogjr'/98, l='MpServer', x=-11.50, y=64.50, z=121.50]]
Chunk stats: MultiplayerChunkCache: 5
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-12,64,127), Chunk: (at 4,4,15 in -1,7; contains blocks -16,0,112 to -1,255,127), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 31 game time, 31 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [ayk['lawdogjr'/98, l='MpServer', x=-11.50, y=64.50, z=121.50]]
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:548)
at java.lang.Thread.run(Thread.java:680)

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Mac OS X (x86_64) version 10.5.8
Java Version: 1.6.0_26, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 84036064 bytes (80 MB) / 208683008 bytes (199 MB) up to 1568538624 bytes (1495 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xmx1500M -Xmx1500M
AABB Pool Size: 7203 (403368 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: Intel GMA X3100 OpenGL Engine GL version 1.2 APPLE-1.5.48, Intel Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: misa32x32
Profiler Position: N/A (disabled)
Vec3 Pool Size: 55 (3080 bytes; 0 MB) allocated, 34 (1904 bytes; 0 MB) used

Someone please help me, I just allocated more RAM to my minecraft, so that should not be the problem. I reinstalled minecraft and the problem is still occurring.