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Can you fix this?
ERROR REPORT:------------- MultiMC Crash Report -------------
Information:
Date: 11-11-2012 18:44:43
Operating System: Mac OS X (Darwin 10.8.0 i386)
MultiMC Version: 4.2.0 jenkins-MultiMC4OSX-61
Minecraft Version: 1.4.2

------------------ Mod Lists -------------------
Jar Mods:
minecraftforge-universal-6.2.1.356.zip
Version:
Filename: minecraftforge-universal-6.2.1.356.zip



----------------- Console Log ------------------
Instance started with command: "/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Commands/java" -Xms512m -Xmx1024m -jar MultiMCLauncher.jar "<username>" "<session ID>" "MultiMC: vminecraft.jar" "854x480"

Loading jars...
Loading URL: file:/Users/wartman/Desktop/random%20folder/MultiMC.app/Contents/Resources/instances/vminecraft.jar/minecraft/bin/minecraft.jar
Loading URL: file:/Users/wartman/Desktop/random%20folder/MultiMC.app/Contents/Resources/instances/vminecraft.jar/minecraft/bin/lwjgl.jar
Loading URL: file:/Users/wartman/Desktop/random%20folder/MultiMC.app/Contents/Resources/instances/vminecraft.jar/minecraft/bin/lwjgl_util.jar
Loading URL: file:/Users/wartman/Desktop/random%20folder/MultiMC.app/Contents/Resources/instances/vminecraft.jar/minecraft/bin/jinput.jar
Loading natives...
Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
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 java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at MultiMCLauncher.main(MultiMCLauncher.java:129)
Instance exited with code 1.
Minecraft has crashed!any help? with my problem????

oooooooi got a problem i updated to build#61 then i can't change back to 6.0.1im trying 6.0.3.0 and same thing as /\
I
I

Quote from rivvest

Use Forge 6.0.1.355 for Minecraft 1.4.2. As MultiMC says, 6.2.1 is for 1.4.3.

i can't deupdate to Forge 6.0.1 can anyone help me?

how do i get a new forge cuz Multimc's is the only one i can download the other ones are screwed

nvm 1.4.4 is out