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Help! I've been playing on a skyblock server for the past couple of days in 1.5.2. As soon as 1.6 came out, I downloaded it, which obviously wouldn't let the server work. I deleted 1.6, and forced an update back to 1.5.2. However, the game is still crashing even though I have no mods installed and the version is correct.



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

Minecraft has stopped running because it encountered a problem; Ticking screen

A full error report has been saved to /Users/JakeSchulman/Library/Application Support/minecraft/crash-reports/crash-2013-07-03_00.49.50-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 e2238da5 --------
Full report at:
/Users/JakeSchulman/Library/Application Support/minecraft/crash-reports/crash-2013-07-03_00.49.50-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 7/3/13 12:49 AM

-- Head --
Stacktrace:
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at aba.<init>(SourceFile:38)
at aba.<init>(SourceFile:44)
at acn.b(SourceFile:44)
at acn.a(SourceFile:27)
at aab.<init>(SourceFile:118)
at bds.<init>(SourceFile:36)
at bdk.a(SourceFile:145)
at dz.a(SourceFile:71)
at ci.b(SourceFile:350)
at bdk.d(SourceFile:95)
at bdn.c(SourceFile:73)

-- Affected screen --
Details:
Screen name: bdn
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1105)
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: 1.5.2
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 493144176 bytes (470 MB) / 530186240 bytes (505 MB) up to 530186240 bytes (505 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
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-7.32.12, 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.NoClassDefFoundError: oo
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at aba.<init>(SourceFile:38)
at aba.<init>(SourceFile:44)
at acn.b(SourceFile:44)
at acn.a(SourceFile:27)
at aab.<init>(SourceFile:118)
at bds.<init>(SourceFile:36)
at bdk.a(SourceFile:145)
at dz.a(SourceFile:71)
at ci.b(SourceFile:350)
at bdk.d(SourceFile:95)
at bdn.c(SourceFile:73)
at net.minecraft.client.Minecraft.l(SourceFile:1105)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: oo
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 28 more
--- END ERROR REPORT da4050ec ----------