Minecraft Forums

I really need help! I have been trying for the past 3 hours to get Forge 1.4.6 to install on my Minecraft but it isn't working! It will get to the "Validating" part, then unexpectedly close the Forge window and Minecraft. This is the error I get:

2013-01-04 01:15:08 [INFO] [ForgeModLoader] Forge Mod Loader version 4.6.12.511 for Minecraft 1.4.6 loading
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Discovering coremods
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Found library file argo-2.25.jar present and correct in lib dir
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Found library file guava-12.0.1.jar present and correct in lib dir
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Found library file asm-all-4.0.jar present and correct in lib dir
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-147.jar present and correct in lib dir
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Running coremod plugins
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin
2013-01-04 01:15:08 [INFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Coremod plugin FMLCorePlugin run successfully
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Running coremod plugin FMLForgePlugin
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Coremod plugin FMLForgePlugin run successfully
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Validating minecraft
2013-01-04 01:15:08 [FINEST] [ForgeModLoader] Minecraft validated, launching...
2013-01-04 01:15:09 [INFO] [STDERR] Exception in thread "Thread-11" java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 01:15:09 [INFO] [STDERR]  at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:269)
2013-01-04 01:15:09 [INFO] [STDERR]  at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)
2013-01-04 01:15:09 [INFO] [STDERR]  at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-01-04 01:15:09 [INFO] [STDERR]  at net.minecraft.Launcher.replace(Launcher.java:136)
2013-01-04 01:15:09 [INFO] [STDERR]  at net.minecraft.Launcher$1.run(Launcher.java:79)
2013-01-04 01:15:09 [INFO] [STDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 01:15:09 [INFO] [STDERR]  at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159)
2013-01-04 01:15:09 [INFO] [STDERR]  at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:254)
2013-01-04 01:15:09 [INFO] [STDERR]  ... 4 more
2013-01-04 01:15:09 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 01:15:09 [INFO] [STDERR]  at java.net.URLClassLoader$1.run(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.net.URLClassLoader$1.run(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.security.AccessController.doPrivileged(Native Method)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.net.URLClassLoader.findClass(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.lang.ClassLoader.loadClass(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.lang.ClassLoader.loadClass(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.lang.Class.forName0(Native Method)
2013-01-04 01:15:09 [INFO] [STDERR]  at java.lang.Class.forName(Unknown Source)
2013-01-04 01:15:09 [INFO] [STDERR]  at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151)
2013-01-04 01:15:09 [INFO] [STDERR]  ... 5 more

Can somebody please help me! Also, I'm haven't seen a topic with the same issue as what I am having, so I hope this is in the correct place.