I had installed forge today everything worked fine, my minecraft started up and I could see the Forge text on the bottom left but whenever I try to create a world I crash;

 

 

 

 

      Minecraft has crashed!     

      ----------------------     

 

Minecraft has stopped running because it encountered a problem; Unexpected error

This error has been saved to /Users/EdrianSanchez/Library/Application Support/minecraft/crash-reports/crash-2012-09-10_19.27.37-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

 

 

 

--- BEGIN ERROR REPORT 65761f35 --------

Generated 9/10/12 7:27 PM

 

- Minecraft Version: 1.3.2

- Operating System: Mac OS X (i386) version 10.7.3

- Java Version: 1.6.0_29, Apple Inc.

- Java VM Version: Java HotSpot Client VM (mixed mode), Apple Inc.

- Memory: 498230456 bytes (475 MB) / 535232512 bytes (510 MB) up to 1070399488 bytes (1020 MB)

- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M

- FML: FML v3.0.196.366 Minecraft Forge 4.1.1.251 2 mods loaded, 2 mods active

FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available

Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available

- LWJGL: 2.4.2

- OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-7.18.11, NVIDIA Corporation

- Is Modded: Definitely; 'forge,fml'

- Type: Client

- Texture Pack: Default

- Profiler Position: N/A (disabled)

 

java.lang.NoClassDefFoundError: paulscode/sound/SoundSystem

at ayq.a(SoundManager.java:235)

at net.minecraft.client.Minecraft.a(Minecraft.java:1937)

at net.minecraft.client.Minecraft.a(Minecraft.java:1885)

at net.minecraft.client.Minecraft.a(Minecraft.java:1821)

at aoo.a(GuiCreateWorld.java:258)

at apn.a(SourceFile:64)

at aoo.a(GuiCreateWorld.java:397)

at apn.d(SourceFile:112)

at apn.m(SourceFile:100)

at net.minecraft.client.Minecraft.l(Minecraft.java:1482)

at net.minecraft.client.Minecraft.J(Minecraft.java:834)

at net.minecraft.client.Minecraft.run(Minecraft.java:764)

at java.lang.Thread.run(Thread.java:680)

Caused by: java.lang.ClassNotFoundException: paulscode.sound.SoundSystem

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:125)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

... 13 more

Caused by: java.lang.NullPointerException

at org.objectweb.asm.ClassReader.<init>(Unknown Source)

at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:27)

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:167)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:118)

... 15 more

--- END ERROR REPORT 325e4982 ----------

 

 

I think you just copied all the contents of the forge download into the jar without placing the files in their respective folders manually. Anyways it says it could not find a class. Reinstall and don't drag paulscode folder straight in but, drag the codec file into the specific folder manually.

Mac default archiver is crap. When it asks you if you want to merge or replace, pick merge. Failing that use a better archiver.