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We tried to load the pixelmon mod and weren't successful and ever since we cannot get onto minecraft. We try to upload a world and it crashes. We have a mac. Thank you for your help!

---- Minecraft Crash Report ----
// Why is it breaking

Time: 5/12/13 7:32 PM
Description: Updating screen events

java.lang.NoClassDefFoundError: aba
at awo.h(SourceFile:135)
at awo.A_(SourceFile:101)
at axr.a(SourceFile:98)
at net.minecraft.client.Minecraft.a(SourceFile:448)
at axu.a(SourceFile:133)
at axr.a(SourceFile:72)
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)
Caused by: java.lang.ClassNotFoundException: aba
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)
... 12 more


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

-- Head --
Stacktrace:
at awo.h(SourceFile:135)
at awo.A_(SourceFile:101)
at axr.a(SourceFile:98)
at net.minecraft.client.Minecraft.a(SourceFile:448)
at axu.a(SourceFile:133)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)

-- Affected screen --
Details:
Screen name: awo
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: 1.5.2
Operating System: Mac OS X (x86_64) version 10.8.3
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 493725528 bytes (470 MB) / 534708224 bytes (509 MB) up to 1069416448 bytes (1019 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: NVIDIA GeForce 9400M OpenGL Engine GL version 2.1 NVIDIA-8.10.44 304.10.65f03, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null