every time i log on if i press e or Esc this pops up
Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Unexpected error

A full error report has been saved to C:\Users\Ryan\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-22_22.32.54-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 75664e7 --------
Full report at:
C:\Users\Ryan\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-22_22.32.54-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 12/22/12 10:32 PM

-- Head --
Stacktrace:
at net.minecraft.client.Minecraft.j(SourceFile:924)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ays['Ryanmoocow3'/189, l='MpServer', x=5.65, y=71.12, z=85.98]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,64,8), Chunk: (at 0,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 3526072 game time, 3105012 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: 84 total; [qn['Skeleton'/1090, l='MpServer', x=-41.50, y=25.00, z=74.50], qn['Skeleton'/1091, l='MpServer', x=-46.50, y=25.00, z=72.50], qc['Creeper'/792, l='MpServer', x=-63.50, y=22.00, z=64.50], qr['Zombie'/1151, l='MpServer', x=44.05, y=16.00, z=130.44], qr['Zombie'/775, l='MpServer', x=50.37, y=38.00, z=29.15], qp['Spider'/1143, l='MpServer', x=30.28, y=31.39, z=154.72], qp['Spider'/59, l='MpServer', x=-72.78, y=20.00, z=66.84], qp['Spider'/63, l='MpServer', x=-65.66, y=21.00, z=68.81], qr['Zombie'/62, l='MpServer', x=-73.13, y=9.00, z=73.59], qn['Skeleton'/61, l='MpServer', x=-65.50, y=22.00, z=62.50], qc['Creeper'/776, l='MpServer', x=50.78, y=37.00, z=26.99], qn['Skeleton'/60, l='MpServer', x=-64.50, y=22.00, z=62.50], qn['Skeleton'/777, l='MpServer', x=47.91, y=40.00, z=31.59], qn['Skeleton'/1033, l='MpServer', x=-4.06, y=20.00, z=74.94], qn['Skeleton'/1034, l='MpServer', x=-3.66, y=20.00, z=69.98], qr['Zombie'/64, l='MpServer', x=-67.47, y=22.00, z=64.59], qo['Slime'/65, l='MpServer', x=-71.22, y=21.00, z=83.22], qc['Creeper'/67, l='MpServer', x=-64.50, y=26.00, z=97.00], qc['Creeper'/76, l='MpServer', x=-51.91, y=21.00, z=61.91], qc['Creeper'/77, l='MpServer', x=-57.03, y=23.00, z=59.63], qr['Zombie'/78, l='MpServer', x=-63.50, y=22.00, z=63.50], ph['Squid'/79, l='MpServer', x=-56.78, y=49.28, z=50.56], ph['Squid'/74, l='MpServer', x=-56.34, y=49.09, z=52.31], ph['Squid'/75, l='MpServer', x=-51.97, y=51.00, z=42.97], ph['Squid'/84, l='MpServer', x=-58.81, y=47.38, z=77.59], qr['Zombie'/81, l='MpServer', x=-57.56, y=20.00, z=77.75], qr['Zombie'/80, l='MpServer', x=-49.06, y=22.00, z=76.38], ph['Squid'/83, l='MpServer', x=-57.41, y=47.38, z=73.66], qp['Spider'/82, l='MpServer', x=-57.53, y=20.00, z=71.19], qn['Skeleton'/92, l='MpServer', x=-38.50, y=19.00, z=25.50], qo['Slime'/95, l='MpServer', x=-42.63, y=11.00, z=60.66], ow['Bat'/94, l='MpServer', x=-23.34, y=21.68, z=29.72], ow['Bat'/89, l='MpServer', x=-43.03, y=33.10, z=7.25], qn['Skeleton'/91, l='MpServer', x=-42.03, y=57.00, z=14.54], qr['Zombie'/90, l='MpServer', x=-40.31, y=56.00, z=14.64], qp['Spider'/102, l='MpServer', x=-31.31, y=59.00, z=16.28], qo['Slime'/103, l='MpServer', x=-26.31, y=28.05, z=83.22], qn['Skeleton'/101, l='MpServer', x=-29.50, y=12.00, z=9.34], qc['Creeper'/96, l='MpServer', x=-42.50, y=21.00, z=57.56], qn['Skeleton'/97, l='MpServer', x=-42.59, y=19.00, z=51.00], qc['Creeper'/110, l='MpServer', x=-9.69, y=20.00, z=84.22], qr['Zombie'/108, l='MpServer', x=-4.00, y=20.00, z=82.56], qc['Creeper'/1057, l='MpServer', x=47.50, y=40.00, z=8.50], qr['Zombie'/109, l='MpServer', x=-12.22, y=20.00, z=86.69], qo['Slime'/104, l='MpServer', x=-25.31, y=28.57, z=85.21], qn['Skeleton'/1087, l='MpServer', x=-41.50, y=29.00, z=86.50], qn['Skeleton'/1086, l='MpServer', x=-35.88, y=30.00, z=86.50], qn['Skeleton'/1085, l='MpServer', x=-36.50, y=29.00, z=85.50], ow['Bat'/842, l='MpServer', x=28.38, y=19.57, z=45.50], ow['Bat'/843, l='MpServer', x=26.25, y=21.10, z=41.53], qr['Zombie'/124, l='MpServer', x=9.66, y=19.00, z=38.84], oz['Cow'/123, l='MpServer', x=12.50, y=68.00, z=16.53], oz['Cow'/122, l='MpServer', x=14.50, y=69.00, z=15.50], ow['Bat'/844, l='MpServer', x=23.50, y=19.92, z=35.06], oz['Cow'/121, l='MpServer', x=12.50, y=68.00, z=15.47], ow['Bat'/845, l='MpServer', x=23.53, y=20.10, z=37.06], qn['Skeleton'/1221, l='MpServer', x=71.50, y=40.00, z=13.50], qn['Skeleton'/137, l='MpServer', x=30.69, y=40.00, z=33.47], qn['Skeleton'/1223, l='MpServer', x=69.50, y=40.00, z=16.50], qn['Skeleton'/1222, l='MpServer', x=72.50, y=40.00, z=17.50], qc['Creeper'/1228, l='MpServer', x=-51.37, y=33.00, z=120.40], qn['Skeleton'/1224, l='MpServer', x=65.50, y=40.00, z=16.50], qn['Skeleton'/154, l='MpServer', x=58.66, y=43.00, z=14.88], ow['Bat'/157, l='MpServer', x=58.59, y=56.39, z=11.50], ow['Bat'/158, l='MpServer', x=44.50, y=18.51, z=34.47], ow['Bat'/159, l='MpServer', x=49.69, y=19.82, z=39.44], oz['Cow'/147, l='MpServer', x=33.72, y=63.00, z=32.59], ow['Bat'/174, l='MpServer', x=71.00, y=36.23, z=12.56], qc['Creeper'/173, l='MpServer', x=76.50, y=21.00, z=11.00], qn['Skeleton'/172, l='MpServer', x=71.50, y=24.00, z=9.03], qc['Creeper'/185, l='MpServer', x=80.50, y=24.00, z=18.56], ays['Ryanmoocow3'/189, l='MpServer', x=5.65, y=71.12, z=85.98], pe['Sheep'/178, l='MpServer', x=74.53, y=69.00, z=7.53], qn['Skeleton'/176, l='MpServer', x=68.63, y=60.00, z=6.09], pe['Sheep'/177, l='MpServer', x=74.53, y=69.00, z=7.53], pe['Sheep'/180, l='MpServer', x=60.07, y=72.00, z=8.11], qc['Creeper'/1153, l='MpServer', x=-60.50, y=38.00, z=120.50], qn['Skeleton'/1157, l='MpServer', x=26.50, y=20.00, z=50.50], qn['Skeleton'/1159, l='MpServer', x=21.50, y=20.00, z=55.50], qn['Skeleton'/1158, l='MpServer', x=25.50, y=20.00, z=51.50], ow['Bat'/1184, l='MpServer', x=58.75, y=16.00, z=124.75], ow['Bat'/1199, l='MpServer', x=-20.00, y=41.64, z=154.06], ow['Bat'/1200, l='MpServer', x=-62.25, y=20.10, z=105.72], qn['Skeleton'/966, l='MpServer', x=66.50, y=12.00, z=45.50]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1871)
at net.minecraft.client.Minecraft.run(SourceFile:548)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_31, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 371642344 bytes (354 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3178 (177968 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 4200 GL version 2.1.8787, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2385 (133560 bytes; 0 MB) allocated, 13 (728 bytes; 0 MB) used

java.lang.VerifyError: (class: auf, method: a signature: (Latb;)V) Incompatible argument to function
at net.minecraft.client.Minecraft.j(SourceFile:924)
at net.minecraft.client.Minecraft.l(SourceFile:1192)
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 3bf8fc33 ----------

eny help