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Every time i start minecraft i get this error report heres the .txt
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---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 3/9/13 3:05 PM
Description: Unexpected error

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)


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

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

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ays['Mrseth101'/183, l='MpServer', x=474.54, y=66.62, z=-130.23]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (464,64,-121), Chunk: (at 0,4,7 in 29,-8; contains blocks 464,0,-128 to 479,255,-113), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 779 game time, 779 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: 104 total; [pe['Sheep'/29, l='MpServer', x=420.31, y=63.00, z=-100.69], pe['Sheep'/31, l='MpServer', x=429.72, y=63.00, z=-98.72], pe['Sheep'/30, l='MpServer', x=427.09, y=63.00, z=-95.03], oy['Chicken'/32, l='MpServer', x=448.10, y=62.90, z=-133.57], oy['Chicken'/33, l='MpServer', x=442.50, y=63.00, z=-140.50], px['item.tile.log.oak'/38, l='MpServer', x=469.75, y=56.13, z=-113.47], px['item.tile.wood.oak'/39, l='MpServer', x=465.13, y=61.13, z=-114.91], px['item.tile.wood.oak'/42, l='MpServer', x=475.34, y=56.13, z=-119.88], px['item.item.apple'/43, l='MpServer', x=467.75, y=56.13, z=-113.31], px['item.item.apple'/40, l='MpServer', x=468.63, y=65.13, z=-119.94], px['item.item.stick'/41, l='MpServer', x=468.44, y=64.13, z=-119.00], oy['Chicken'/47, l='MpServer', x=466.34, y=62.54, z=-117.84], px['item.item.pickaxeWood'/44, l='MpServer', x=475.38, y=56.13, z=-119.88], px['item.item.bread'/45, l='MpServer', x=468.41, y=64.13, z=-119.47], pe['Sheep'/51, l='MpServer', x=476.91, y=63.00, z=-186.59], oy['Chicken'/50, l='MpServer', x=470.28, y=62.49, z=-116.71], oy['Chicken'/49, l='MpServer', x=467.15, y=68.30, z=-123.98], oy['Chicken'/48, l='MpServer', x=455.24, y=63.73, z=-116.40], oy['Chicken'/55, l='MpServer', x=475.50, y=63.00, z=-181.50], pe['Sheep'/54, l='MpServer', x=480.57, y=65.00, z=-179.50], pe['Sheep'/53, l='MpServer', x=473.96, y=65.00, z=-181.18], pe['Sheep'/52, l='MpServer', x=480.16, y=62.00, z=-190.76], oy['Chicken'/59, l='MpServer', x=493.69, y=73.00, z=-129.47], oy['Chicken'/58, l='MpServer', x=475.50, y=63.00, z=-177.50], oy['Chicken'/57, l='MpServer', x=468.50, y=62.44, z=-177.47], oy['Chicken'/56, l='MpServer', x=476.50, y=64.00, z=-180.50], oy['Chicken'/62, l='MpServer', x=490.28, y=71.00, z=-128.53], oy['Chicken'/61, l='MpServer', x=497.50, y=74.00, z=-138.50], oy['Chicken'/60, l='MpServer', x=498.50, y=85.00, z=-140.50], oy['Chicken'/68, l='MpServer', x=504.50, y=73.00, z=-119.50], oy['Chicken'/69, l='MpServer', x=506.50, y=77.00, z=-116.50], oy['Chicken'/70, l='MpServer', x=506.50, y=77.00, z=-116.50], oy['Chicken'/71, l='MpServer', x=508.50, y=73.00, z=-115.50], oy['Chicken'/85, l='MpServer', x=528.50, y=70.00, z=-106.50], oy['Chicken'/87, l='MpServer', x=528.50, y=71.00, z=-107.50], oy['Chicken'/86, l='MpServer', x=525.50, y=71.00, z=-106.50], oy['Chicken'/93, l='MpServer', x=529.50, y=66.00, z=-89.50], oz['Cow'/92, l='MpServer', x=521.47, y=72.00, z=-113.47], oy['Chicken'/95, l='MpServer', x=531.50, y=66.00, z=-92.50], oy['Chicken'/94, l='MpServer', x=533.50, y=66.00, z=-89.50], oz['Cow'/89, l='MpServer', x=524.50, y=71.00, z=-115.66], oy['Chicken'/88, l='MpServer', x=527.50, y=69.00, z=-109.50], oz['Cow'/91, l='MpServer', x=521.47, y=72.00, z=-113.53], oz['Cow'/90, l='MpServer', x=522.59, y=74.00, z=-115.59], oy['Chicken'/100, l='MpServer', x=523.50, y=64.00, z=-76.50], oy['Chicken'/98, l='MpServer', x=521.47, y=66.00, z=-84.75], oy['Chicken'/99, l='MpServer', x=524.50, y=64.00, z=-76.50], oy['Chicken'/96, l='MpServer', x=532.50, y=66.00, z=-92.50], oy['Chicken'/97, l='MpServer', x=524.50, y=64.00, z=-76.50], oy['Chicken'/106, l='MpServer', x=540.50, y=69.00, z=-133.50], oy['Chicken'/107, l='MpServer', x=539.50, y=69.00, z=-132.50], oy['Chicken'/104, l='MpServer', x=539.50, y=69.00, z=-130.50], oy['Chicken'/105, l='MpServer', x=541.50, y=69.00, z=-132.50], oy['Chicken'/112, l='MpServer', x=554.50, y=72.00, z=-146.50], oz['Cow'/120, l='MpServer', x=552.13, y=63.00, z=-66.22], ow['Bat'/184, l='MpServer', x=504.30, y=37.37, z=-107.50], ow['Bat'/190, l='MpServer', x=503.25, y=37.48, z=-108.19], ow['Bat'/191, l='MpServer', x=507.78, y=37.68, z=-107.47], ays['Mrseth101'/183, l='MpServer', x=474.54, y=66.62, z=-130.23], px['item.item.apple'/4130, l='MpServer', x=537.13, y=83.13, z=-176.13], px['item.tile.sapling.oak'/9046, l='MpServer', x=425.13, y=70.13, z=-162.88], px['item.item.apple'/4215, l='MpServer', x=532.13, y=77.13, z=-111.88], px['item.tile.gravel'/4167, l='MpServer', x=433.44, y=14.13, z=-100.13], px['item.tile.gravel'/4668, l='MpServer', x=495.59, y=41.13, z=-101.16], px['item.tile.dirt'/4669, l='MpServer', x=474.75, y=66.13, z=-131.88], pw['Falling Block'/9759, l='MpServer', x=577.50, y=30.72, z=-236.50], pw['Falling Block'/5442, l='MpServer', x=577.50, y=30.88, z=-236.50], ow['Bat'/1439, l='MpServer', x=536.44, y=36.60, z=-90.04], ow['Bat'/1460, l='MpServer', x=458.11, y=21.43, z=-135.53], ow['Bat'/1461, l='MpServer', x=464.29, y=21.95, z=-153.25], ow['Bat'/1440, l='MpServer', x=541.45, y=33.26, z=-95.57], ow['Bat'/1572, l='MpServer', x=445.25, y=20.10, z=-117.53], px['item.tile.sapling.oak'/2200, l='MpServer', x=512.13, y=73.13, z=-80.88], px['item.tile.gravel'/10956, l='MpServer', x=494.97, y=41.13, z=-100.13], px['item.tile.sapling.oak'/2786, l='MpServer', x=521.88, y=80.13, z=-139.19], px['item.tile.sapling.oak'/6934, l='MpServer', x=520.13, y=75.13, z=-171.88], px['item.tile.dirt'/6956, l='MpServer', x=474.88, y=67.13, z=-132.88], px['item.item.seeds'/6955, l='MpServer', x=474.13, y=67.13, z=-132.88], px['item.item.seeds'/10737, l='MpServer', x=510.66, y=64.13, z=-85.88], px['item.item.apple'/11967, l='MpServer', x=517.88, y=74.13, z=-85.13], px['item.item.string'/11906, l='MpServer', x=517.13, y=35.13, z=-73.88], px['item.tile.sapling.oak'/12017, l='MpServer', x=515.28, y=80.13, z=-104.88], px['item.tile.sapling.oak'/12018, l='MpServer', x=486.88, y=75.13, z=-102.75], ow['Bat'/12020, l='MpServer', x=455.50, y=15.00, z=-91.50], ow['Bat'/12021, l='MpServer', x=455.50, y=15.00, z=-88.50], ow['Bat'/12022, l='MpServer', x=464.50, y=21.00, z=-156.50], ow['Bat'/12026, l='MpServer', x=455.50, y=21.00, z=-132.50], px['item.tile.sapling.oak'/12030, l='MpServer', x=424.75, y=69.69, z=-162.34], px['item.tile.sapling.oak'/12012, l='MpServer', x=514.88, y=81.13, z=-148.59], px['item.tile.sapling.oak'/12014, l='MpServer', x=485.88, y=74.13, z=-137.59], px['item.tile.rail'/11986, l='MpServer', x=523.46, y=35.13, z=-74.20], px['item.tile.rail'/11990, l='MpServer', x=525.11, y=35.13, z=-72.22], px['item.tile.rail'/11992, l='MpServer', x=526.16, y=35.13, z=-72.22], px['item.tile.sapling.oak'/11998, l='MpServer', x=503.44, y=80.13, z=-111.69], px['item.tile.sapling.oak'/11996, l='MpServer', x=537.72, y=80.13, z=-168.75], px['item.tile.rail'/11971, l='MpServer', x=517.13, y=35.13, z=-73.88], px['item.tile.sapling.oak'/11973, l='MpServer', x=509.66, y=82.13, z=-101.84], px['item.tile.sapling.oak'/3538, l='MpServer', x=490.44, y=81.13, z=-131.88], px['item.tile.sapling.oak'/3536, l='MpServer', x=491.88, y=81.13, z=-131.13], px['item.tile.sapling.oak'/3537, l='MpServer', x=523.56, y=80.13, z=-141.13], px['item.tile.sapling.oak'/3462, l='MpServer', x=487.88, y=75.13, z=-104.03], px['item.tile.sapling.oak'/3338, l='MpServer', x=514.13, y=65.13, z=-79.88], pw['Falling Block'/8160, l='MpServer', x=577.50, y=31.00, z=-236.50], px['item.tile.gravel'/11751, l='MpServer', x=433.13, y=14.13, z=-100.88]]
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: 1.4.7
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 296073664 bytes (282 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 27402 (1534512 bytes; 1 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdates, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: Intel 945GM GL version 1.4.0 - Build 7.14.10.4926, Intel
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2896 (162176 bytes; 0 MB) allocated, 15 (840 bytes; 0 MB) used