Client> 2013-10-16 15:32:15 [SEVERE] [ForgeModLoader] Unable to launch
Client> java.lang.reflect.InvocationTargetException
Client> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Client> 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
Client> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
Client> 	at java.lang.reflect.Method.invoke(Unknown Source)
Client> 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
Client> 	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Client> Caused by: java.lang.NoClassDefFoundError: net/minecraft/logging/LogAgent
Client> 	at net.minecraft.client.main.Main.main(SourceFile:37)
Client> 	... 6 more
Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.logging.LogAgent
Client> 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
Client> 	at java.lang.ClassLoader.loadClass(Unknown Source)
Client> 	at java.lang.ClassLoader.loadClass(Unknown Source)
Client> 	... 7 more
Client> Caused by: java.lang.IncompatibleClassChangeError: Implementing class
Client> 	at java.lang.ClassLoader.defineClass1(Native Method)
Client> 	at java.lang.ClassLoader.defineClass(Unknown Source)
Client> 	at java.security.SecureClassLoader.defineClass(Unknown Source)
Client> 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
Client> 	... 9 more
Game ended with no troubles detected (exit code 0)