me sale esto:

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to /Users/salvadorgodoyojeda/Library/Application Support/minecraft/crash-reports/crash-2013-04-14_00.46.01-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 5377a4a2 --------
Full report at:
/Users/salvadorgodoyojeda/Library/Application Support/minecraft/crash-reports/crash-2013-04-14_00.46.01-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 14/04/13 0:46

-- Head --
Stacktrace:
at cc.a(SourceFile:75)
at cc.a(SourceFile:68)
at beb.a(SourceFile:23)
at beb.<init>(SourceFile:18)
at axa.A_(SourceFile:83)
at axr.a(SourceFile:98)
at net.minecraft.client.Minecraft.a(SourceFile:448)
at bkg.a(SourceFile:240)
at axr.a(SourceFile:72)
at bkg.a(SourceFile:470)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)

-- Affected screen --
Details:
Screen name: axa
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Thread.java:680)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Mac OS X (x86_64) version 10.8
Java Version: 1.6.0_35, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 490839784 bytes (468 MB) / 534708224 bytes (509 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 APPLE-8.0.51, Intel Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.VerifyError: (class: cf, method: a signature: (BLjava/lang/StringLcf Wrong return type in function
at cc.a(SourceFile:75)
at cc.a(SourceFile:68)
at beb.a(SourceFile:23)
at beb.<init>(SourceFile:18)
at axa.A_(SourceFile:83)
at axr.a(SourceFile:98)
at net.minecraft.client.Minecraft.a(SourceFile:448)
at bkg.a(SourceFile:240)
at axr.a(SourceFile:72)
at bkg.a(SourceFile:470)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Thread.java:680)
--- END ERROR REPORT 638c5915 ----------