Crash

---- Minecraft Crash Report ----
// Why did you do that?

Time: 5/07/13 2:12 PM
Description: Unexpected error

java.lang.ClassCastException: arr cannot be cast to asf
	at yu.a(SourceFile:39)
	at xz.a(SourceFile:102)
	at bct.a(SourceFile:254)
	at atn.c(SourceFile:1058)
	at atn.k(SourceFile:1344)
	at atn.S(SourceFile:662)
	at atn.d(SourceFile:618)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at yu.a(SourceFile:39)
	at xz.a(SourceFile:102)
	at bct.a(SourceFile:254)
	at atn.c(SourceFile:1058)

-- Affected level --
Details:
	Level name: MpServer
	All players: 2 total; [bcx['Pengmatix'/56051, l='MpServer', x=1407.30, y=68.62, z=-982.67], ben['TomGames101'/57053, l='MpServer', x=1344.69, y=65.00, z=-907.25]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (1411,67,-976), Chunk: (at 3,4,0 in 88,-61; contains blocks 1408,0,-976 to 1423,255,-961), Region: (2,-2; contains chunks 64,-64 to 95,-33, blocks 1024,0,-1024 to 1535,255,-513)
	Level time: 8389846 game time, 8461893 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 31 total; [tt['Zombie'/88373, l='MpServer', x=1453.50, y=66.00, z=-1019.50], ro['Cow'/56079, l='MpServer', x=1365.25, y=63.00, z=-988.63], ro['Cow'/56090, l='MpServer', x=1337.13, y=69.00, z=-1023.88], rn['Chicken'/82866, l='MpServer', x=1473.53, y=73.00, z=-908.41], sp['item.item.egg'/84754, l='MpServer', x=1369.34, y=62.13, z=-991.16], ben['TomGames101'/57053, l='MpServer', x=1411.16, y=67.00, z=-984.38], sr['entity.MinecartChest.name'/56107, l='MpServer', x=1481.50, y=23.50, z=-904.50], sr['entity.MinecartChest.name'/56108, l='MpServer', x=1474.50, y=23.34, z=-906.50], rn['Chicken'/56096, l='MpServer', x=1368.53, y=62.58, z=-989.38], rn['Chicken'/56101, l='MpServer', x=1435.44, y=67.00, z=-983.56], tc['Creeper'/86948, l='MpServer', x=1469.50, y=34.00, z=-1035.50], sp['item.item.egg'/85841, l='MpServer', x=1393.72, y=65.13, z=-952.03], ro['Cow'/56122, l='MpServer', x=1386.72, y=64.00, z=-978.56], rl['Bat'/88055, l='MpServer', x=1442.69, y=33.10, z=-1015.25], rl['Bat'/88056, l='MpServer', x=1450.59, y=24.77, z=-1015.16], tt['Zombie'/88160, l='MpServer', x=1347.84, y=64.00, z=-1003.50], tq['Spider'/88440, l='MpServer', x=1479.56, y=71.00, z=-980.19], rp['Horse'/69250, l='MpServer', x=1412.06, y=67.00, z=-975.94], tt['Zombie'/87977, l='MpServer', x=1473.50, y=67.00, z=-1015.50], ben['TomGames101'/57053, l='MpServer', x=1344.69, y=65.00, z=-907.25], tt['Zombie'/88152, l='MpServer', x=1452.50, y=30.00, z=-1054.50], ben['TomGames101'/57053, l='MpServer', x=1344.69, y=65.00, z=-907.25], tq['Spider'/88478, l='MpServer', x=1467.50, y=72.00, z=-976.50], tt['Zombie'/87908, l='MpServer', x=1466.50, y=66.00, z=-956.50], bcx['Pengmatix'/56051, l='MpServer', x=1407.30, y=68.62, z=-982.67], tt['Zombie'/88213, l='MpServer', x=1334.50, y=64.00, z=-1056.50], tt['Zombie'/88214, l='MpServer', x=1333.50, y=64.00, z=-1055.50], ben['TomGames101'/57053, l='MpServer', x=1417.34, y=71.00, z=-972.59], rn['Chicken'/56052, l='MpServer', x=1341.38, y=64.00, z=-1058.50], ben['TomGames101'/57053, l='MpServer', x=1414.13, y=67.00, z=-978.25], tt['Zombie'/88279, l='MpServer', x=1354.50, y=65.00, z=-1013.50]]
	Retry entities: 0 total; []
Stacktrace:
	at bcu.a(SourceFile:284)
	at atn.b(SourceFile:1743)
	at atn.d(SourceFile:632)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.1
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 78992912 bytes (75 MB) / 192200704 bytes (183 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 4338 (242928 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.1
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7730M GL version 4.2.11566 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1811 (101416 bytes; 0 MB) allocated, 15 (840 bytes; 0 MB) used