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minecraft keeps crashing and giving this error in the client.txt file

---- Minecraft Crash Report ----
// I feel sad now
Time: 27/01/13 7:33 PM
Description: Unexpected error
java.lang.NullPointerException
at tz.a(Unknown Source)
at T.a(Unknown Source)
at T.a(Unknown Source)
at Do.t(Unknown Source)
at net.minecraft.client.Minecraft.aw(Unknown Source)
at net.minecraft.client.Minecraft.aY(Unknown Source)
at net.minecraft.client.Minecraft.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at tz.a(Unknown Source)
at T.a(Unknown Source)
at T.a(Unknown Source)
at Do.t(Unknown Source)
-- Affected level --
Details:
Level name: MpServer
All players: 9 total; [lI['langaan123abc'/356810, l='MpServer', x=324.66, y=7.62, z=-617.41], mz['kastor246'/239249, l='MpServer', x=324.94, y=6.00, z=-620.84], mz['jords2232'/780, l='MpServer', x=324.25, y=8.47, z=-615.09], mz['Cheryl0'/360110, l='MpServer', x=322.16, y=6.06, z=-640.78], mz['mandm19'/255186, l='MpServer', x=317.95, y=13.25, z=-624.84], mz['X0verdriveX'/256936, l='MpServer', x=319.03, y=18.41, z=-628.40], mz['NoguchiBros545'/241036, l='MpServer', x=332.78, y=6.00, z=-631.34], mz['Butes12'/373274, l='MpServer', x=336.72, y=2.09, z=-650.56], mz['despirbeast'/334394, l='MpServer', x=295.80, y=7.41, z=-637.88]]
Chunk stats: MultiplayerChunkCache: 49
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-3379,129,4740), Chunk: (at 13,8,4 in -212,296; contains blocks -3392,0,4736 to -3377,255,4751), Region: (-7,9; contains chunks -224,288 to -193,319, blocks -3584,0,4608 to -3073,255,5119)
Level time: 53308983 game time, 53435190 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: 53 total; [mz['Butes12'/373274, l='MpServer', x=336.72, y=2.09, z=-650.56], mz['Cheryl0'/360110, l='MpServer', x=322.16, y=6.06, z=-640.78], mz['kastor246'/239249, l='MpServer', x=324.94, y=6.00, z=-620.84], mz['dampmarine4'/351712, l='MpServer', x=342.40, y=4.95, z=-602.24], zm['item.tile.tripWireSource'/379335, l='MpServer', x=330.97, y=6.13, z=-633.13], zP['arrow'/379212, l='MpServer', x=318.31, y=6.05, z=-634.56], mz['JOGGRY'/370714, l='MpServer', x=338.66, y=6.22, z=-652.85], zP['arrow'/379203, l='MpServer', x=311.91, y=4.05, z=-629.03], mz['NoguchiBros545'/241036, l='MpServer', x=336.06, y=6.00, z=-641.16], zP['arrow'/379200, l='MpServer', x=320.66, y=6.05, z=-615.69], mz['Butes12'/373274, l='MpServer', x=365.00, y=2.00, z=-640.35], mz['Cheryl0'/360110, l='MpServer', x=336.09, y=6.00, z=-645.97], mz['dampmarine4'/351712, l='MpServer', x=339.14, y=2.00, z=-647.01], mz['NoguchiBros545'/241036, l='MpServer', x=356.12, y=2.69, z=-623.25], mz['despirbeast'/334394, l='MpServer', x=302.56, y=4.00, z=-591.84], zP['arrow'/379593, l='MpServer', x=337.33, y=2.26, z=-650.45], mz['Talpro8'/361538, l='MpServer', x=337.00, y=1.00, z=-650.47], zP['arrow'/379462, l='MpServer', x=319.69, y=6.05, z=-624.59], mz['hell_holder'/368514, l='MpServer', x=358.88, y=1.91, z=-628.38], ud['Painting'/148, l='MpServer', x=317.00, y=2.50, z=-650.94], mz['kastor246'/239249, l='MpServer', x=324.94, y=6.00, z=-620.84], mz['yancmo'/359885, l='MpServer', x=340.72, y=1.69, z=-650.94], mz['yancmo'/359885, l='MpServer', x=337.56, y=3.00, z=-596.84], mz['jords2232'/780, l='MpServer', x=324.25, y=8.47, z=-615.09], mz['NoguchiBros545'/241036, l='MpServer', x=332.78, y=6.00, z=-631.34], zP['arrow'/379487, l='MpServer', x=337.38, y=1.02, z=-641.78], lI['langaan123abc'/356810, l='MpServer', x=324.66, y=7.62, z=-617.41], mz['jords2232'/780, l='MpServer', x=324.25, y=8.47, z=-615.09], mz['NoguchiBros545'/241036, l='MpServer', x=345.34, y=0.75, z=-641.00], mz['hell_holder'/368514, l='MpServer', x=362.44, y=2.00, z=-650.84], zm['item.tile.flower'/379291, l='MpServer', x=330.81, y=6.13, z=-633.53], mz['IImpulsic'/337764, l='MpServer', x=340.16, y=2.00, z=-650.07], mz['despirbeast'/334394, l='MpServer', x=318.92, y=19.27, z=-652.89], mz['rtjzt123'/334450, l='MpServer', x=312.41, y=23.06, z=-659.25], zP['arrow'/379578, l='MpServer', x=336.91, y=1.82, z=-650.97], zP['arrow'/379577, l='MpServer', x=336.69, y=2.24, z=-650.96], zP['arrow'/379194, l='MpServer', x=321.06, y=6.05, z=-624.31], mz['JOGGRY'/370714, l='MpServer', x=363.52, y=2.00, z=-645.21], mz['NoguchiBros545'/241036, l='MpServer', x=358.00, y=3.16, z=-630.94], mz['Cheryl0'/360110, l='MpServer', x=322.16, y=6.06, z=-640.78], mz['mandm19'/255186, l='MpServer', x=317.95, y=13.25, z=-624.84], mz['NoguchiBros545'/241036, l='MpServer', x=332.78, y=6.00, z=-631.34], zP['arrow'/379296, l='MpServer', x=320.38, y=9.03, z=-644.38], mz['Butes12'/373274, l='MpServer', x=336.72, y=2.09, z=-650.56], zP['arrow'/379298, l='MpServer', x=320.31, y=6.05, z=-633.38], zm['item.tile.button'/379300, l='MpServer', x=331.13, y=6.13, z=-633.41], zm['item.item.bootsDiamond'/379303, l='MpServer', x=331.03, y=6.13, z=-633.19], mz['X0verdriveX'/256936, l='MpServer', x=319.03, y=18.41, z=-628.40], mz['despirbeast'/334394, l='MpServer', x=295.80, y=7.41, z=-637.88], mz['despirbeast'/334394, l='MpServer', x=295.80, y=7.41, z=-637.88], mz['MrMegakiller64'/259573, l='MpServer', x=337.77, y=3.00, z=-597.98], mz['mandm19'/255186, l='MpServer', x=317.95, y=13.25, z=-624.84], mz['X0verdriveX'/256936, l='MpServer', x=319.03, y=18.41, z=-628.40]]
Retry entities: 0 total; []
Stacktrace:
at lF.a(Unknown Source)
at net.minecraft.client.Minecraft.a(Unknown Source)
at net.minecraft.client.Minecraft.run(Unknown Source)
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: 1.7.0_11, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 397800192 bytes (379 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 1221 (68376 bytes; 0 MB) allocated, 121 (6776 bytes; 0 MB) used
Suspicious classes: [net.minecraft.client.a]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 4800 Series GL version 3.3.10750 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: faithful32pack.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: 102 (5712 bytes; 0 MB) allocated, 64 (3584 bytes; 0 MB) used