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My friend had this error after loaded mods. Can anyone please help?

Exception in thread "main" [23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NoClassDefFoundError: codechicken/lib/asm/ASMInit
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at codechicken.nei.asm.NEICorePlugin.<init>(NEICorePlugin.java:18)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at java.lang.reflect.Constructor.newInstance(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at java.lang.Class.newInstance(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:501)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.ClassNotFoundException: codechicken.lib.asm.ASMInit
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at java.lang.ClassLoader.loadClass(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at java.lang.ClassLoader.loadClass(Unknown Source)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	... 15 more
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: Caused by: java.lang.NullPointerException
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[23:31:13] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	... 17 more