Minecraft Forums

Hi, I've been having problems lately with my game startup after I installed a mod into my launcher. I've followed the same instructions as to how to install mods onto the latest launcher, but the same error shows up as follows:
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- (We'll do this automatically later ;D) ----
Client> Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/client/main/Main
Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.client.main.Main
Client> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
Client> at java.security.AccessController.doPrivileged(Native Method)
Client> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
Client> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Game ended with bad state (exit code 1)

I have little experience with java, so I was hoping someone could explain what exactly the problem is. I've tried following the error to the files mentioned, and they are there, but it refuses to recognize them. I'm on a Mac running 1.6.0_51 java.

Just wondering, what mod? Because this same thing happened to me and I am also on Mac.

Quote from njredsoxfan

Just wondering, what mod? Because this same thing happened to me and I am also on Mac.

I was attempting to install Kodehawa's cheating essentials for use as help in building an adventure map.

I have the same problem with Optifine. I can launch the game with Forge installed with the installer, but when I install Optifine with Forge (On the Optifine page it says it is compatible with the forge version I am using) it gives me this:
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- (We'll do this automatically later ;D) ----
Client> Jul 17, 2013 10:15:50 AM net.minecraft.launchwrapper.LogWrapper log
Client> INFO: Using tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Client> 2013-07-17 10:15:50 [INFO] [ForgeModLoader] Forge Mod Loader version 6.2.19.789 for Minecraft 1.6.2 loading
Client> 2013-07-17 10:15:50 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.6.0_51, running on Mac OS X:x86_64:10.7.5, installed at /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
Client> 2013-07-17 10:15:50 [INFO] [STDOUT] Loaded 39 rules from AccessTransformer config file fml_at.cfg
Client> 2013-07-17 10:15:50 [INFO] [STDOUT] Loaded 107 rules from AccessTransformer config file forge_at.cfg
Client> 2013-07-17 10:15:52 [INFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d
Client> 2013-07-17 10:15:52 [INFO] [STDOUT] A CRITICAL PROBLEM OCCURED INITIALIZING MINECRAFT - LIKELY YOU HAVE AN INCORRECT VERSION FOR THIS FML
Client> 2013-07-17 10:15:52 [INFO] [STDERR] java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:197)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:76)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at net.minecraft.launchwrapper.Launch.launch(Launch.java:51)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] Caused by: java.lang.reflect.InvocationTargetException
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Method.java:597)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:190)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] ... 6 more
Client> 2013-07-17 10:15:52 [INFO] [STDERR] Caused by: java.lang.NoClassDefFoundError: net/minecraft/crash/CallableMinecraftVersion
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.common.Loader.<init>(Loader.java:184)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at cpw.mods.fml.common.Loader.instance(Loader.java:163)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] ... 11 more
Client> 2013-07-17 10:15:52 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.crash.CallableMinecraftVersion
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] ... 13 more
Client> 2013-07-17 10:15:52 [INFO] [STDERR] Caused by: java.lang.NullPointerException
Client> 2013-07-17 10:15:52 [INFO] [STDERR] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
Client> 2013-07-17 10:15:52 [INFO] [STDERR] ... 15 more
Client> 2013-07-17 10:15:52 [SEVERE] [ForgeModLoader] An error occurred trying to configure the minecraft home at /Users/KStebbins17/Library/Application Support/minecraft for Forge Mod Loader
Client> java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
Client> at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:197)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
Client> at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:76)
Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:51)
Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Client> Caused by: java.lang.reflect.InvocationTargetException
Client> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Client> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Client> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Client> at java.lang.reflect.Method.invoke(Method.java:597)
Client> at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:190)
Client> ... 6 more
Client> Caused by: java.lang.NoClassDefFoundError: net/minecraft/crash/CallableMinecraftVersion
Client> at cpw.mods.fml.common.Loader.<init>(Loader.java:184)
Client> at cpw.mods.fml.common.Loader.instance(Loader.java:163)
Client> ... 11 more
Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.crash.CallableMinecraftVersion
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Client> ... 13 more
Client> Caused by: java.lang.NullPointerException
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
Client> ... 15 more
Client> 2013-07-17 10:15:52 [SEVERE] [ForgeModLoader] Unable to launch
Client> java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
Client> at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:197)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
Client> at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
Client> at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:76)
Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:51)
Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Client> Caused by: java.lang.reflect.InvocationTargetException
Client> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Client> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Client> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Client> at java.lang.reflect.Method.invoke(Method.java:597)
Client> at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:190)
Client> ... 6 more
Client> Caused by: java.lang.NoClassDefFoundError: net/minecraft/crash/CallableMinecraftVersion
Client> at cpw.mods.fml.common.Loader.<init>(Loader.java:184)
Client> at cpw.mods.fml.common.Loader.instance(Loader.java:163)
Client> ... 11 more
Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.crash.CallableMinecraftVersion
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Client> ... 13 more
Client> Caused by: java.lang.NullPointerException
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
Client> ... 15 more
Game ended with no troubles detected (exit code 0)By the way, I am using a Mac also. Any help is appreciated!!! Thanks in advance!!!!

DO NOT override folders in Mac, Mac override all of the content, so if you add something and something it's not in the folder, Mac will delete the other files.

Optifine works fine for my mac.
NEI's the one that crashes mine craft and i get this:


Launcher 1.2.1 (through bootstrap 4) started on osx...
Current time is Aug 14, 2013 6:05:15 PM
System.getProperty('os.name') == 'Mac OS X'
System.getProperty('os.version') == '10.7.5'
System.getProperty('os.arch') == 'x86_64'
System.getProperty('java.version') == '1.6.0_45'
System.getProperty('java.vendor') == 'Apple Inc.'
System.getProperty('sun.arch.data.model') == '64'
Delta time to compare resources: 354 ms
Download job 'Resources' skipped as there are no files to download
Job 'Resources' finished successfully
Loaded 4 profile(s); selected 'NEI'
Refreshing auth...
Logging in with access token
Getting syncinfo for selected version
Queueing library & version downloads
Download job 'Version & Libraries' started (8 threads, 19 files)
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-osx.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/jijili/Library/Application Support/minecraft/versions/NEI/NEI.jar for job 'Version & Libraries': Couldn't connect to server (responded with 403) but have local file, assuming it's good
Finished downloading /Users/jijili/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.0/lwjgl-platform-2.9.0-natives-osx.jar for job 'Version & Libraries': Used own copy as it matched etag
Job 'Version & Libraries' finished successfully
Launching game
Looking for old natives to clean up...
Unpacking natives to /Users/jijili/Library/Application Support/minecraft/versions/NEI/NEI-natives-1376528720529560000
Launching in /Users/jijili/Library/Application Support/minecraft
Running /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java -Xdock:icon=/Users/jijili/Library/Application Support/minecraft/assets/icons/minecraft.icns -Xdock:name=Minecraft -Xmx1G -Djava.library.path=/Users/jijili/Library/Application Support/minecraft/versions/NEI/NEI-natives-1376528720529560000 -cp /Users/jijili/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar:/Users/jijili/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar:/Users/jijili/Library/Application Support/minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar:/Users/jijili/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar:/Users/jijili/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/jijili/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar:/Users/jijili/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar:/Users/jijili/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar:/Users/jijili/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar:/Users/jijili/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar:/Users/jijili/Library/Application Support/minecraft/versions/NEI/NEI.jar net.minecraft.client.main.Main --username iceberg723 --session token:e55841e09c4c4eb684ec00c11471ff5a:b6c2ac9622604abc911ab467b98b8a03 --version NEI --gameDir /Users/jijili/Library/Application Support/minecraft --assetsDir /Users/jijili/Library/Application Support/minecraft/assets
Client> 2013-08-14 18:05:21 [CLIENT] [INFO] Setting user: iceberg723
Client> 2013-08-14 18:05:21 [CLIENT] [INFO] (Session ID is token:e55841e09c4c4eb684ec00c11471ff5a:b6c2ac9622604abc911ab467b98b8a03)
Client> Exception in thread "main" java.lang.ExceptionInInitializerError
Client> at bt.<clinit>(SourceFile:7)
Client> at yb.v(SourceFile:495)
Client> at kz.a(SourceFile:139)
Client> at kz.c(SourceFile:85)
Client> at yb.<clinit>(SourceFile:310)
Client> at aqw.<clinit>(SourceFile:362)
Client> at kz.a(SourceFile:122)
Client> at kz.<clinit>(SourceFile:55)
Client> at ats.<init>(SourceFile:201)
Client> at net.minecraft.client.main.Main.main(SourceFile:83)
Client> Caused by: java.lang.NullPointerException
Client> at java.io.Reader.<init>(Reader.java:61)
Client> at java.io.InputStreamReader.<init>(InputStreamReader.java:96)
Client> at org.apache.commons.io.IOUtils.readLines(IOUtils.java:986)
Client> at bu.<init>(SourceFile:26)
Client> at bu.<clinit>(SourceFile:19)
Client> ... 10 more
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting /Users/jijili/Library/Application Support/minecraft/versions/NEI/NEI-natives-1376528720529560000