Will not launch 1.4.6 (latest) or any 1.4.x for that matter

[Mrfluffybuns]

Launcher Version: Latest

Operating System: Mac OSx Lion 1.7.4

Java Version: jre-7u10-macosx-x64

Antivirus Program: None

Description of Problem:

Whenever I use the Technic Launcher and try to use the latest build, I get a blank minecraft screen and a little dialogue box that pops up with the title "Hello!" Both screens remain blank for a bit and then a third dialogue box pops up stating to view the log.

Error Messages:

Minecraft failed to start, errors reported in the log.

Error Log:

2012-12-29 22:29:21 [iNFO] [ForgeModLoader] Forge Mod Loader version 4.6.12.511 for Minecraft 1.4.6 loading

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] All core mods are successfully located

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Discovering coremods

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.7.0.1.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.7.0.1.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loaded coremod CodeChickenCore 0.7.0.1.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.4.4.0.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.4.4.0.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.4.4.0.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Found a candidate coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loading coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Loaded coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar

2012-12-29 22:29:21 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-2.25.jar

2012-12-29 22:29:21 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-2.25.jar

2012-12-29 22:29:22 [FINEST] [ForgeModLoader] Download complete

2012-12-29 22:29:22 [iNFO] [ForgeModLoader] Download complete

2012-12-29 22:29:22 [FINEST] [ForgeModLoader] Library file argo-2.25.jar was downloaded and verified successfully

2012-12-29 22:29:22 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar

2012-12-29 22:29:22 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Download complete

2012-12-29 22:29:24 [iNFO] [ForgeModLoader] Download complete

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Library file guava-12.0.1.jar was downloaded and verified successfully

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar

2012-12-29 22:29:24 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Download complete

2012-12-29 22:29:24 [iNFO] [ForgeModLoader] Download complete

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Library file asm-all-4.0.jar was downloaded and verified successfully

2012-12-29 22:29:24 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar

2012-12-29 22:29:24 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Download complete

2012-12-29 22:29:26 [iNFO] [ForgeModLoader] Download complete

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Library file bcprov-jdk15on-147.jar was downloaded and verified successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugins

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin

2012-12-29 22:29:26 [iNFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Coremod plugin FMLCorePlugin run successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugin FMLForgePlugin

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Coremod plugin FMLForgePlugin run successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugin CodeChickenCorePlugin

2012-12-29 22:29:26 [iNFO] [sTDOUT] Adding Accesstransformer map: codechickencore_at.cfg

2012-12-29 22:29:26 [iNFO] [sTDOUT] Adding AccessTransformer: chickenchunks_at.cfg

2012-12-29 22:29:26 [iNFO] [sTDOUT] Adding Accesstransformer map: temp.dat

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Coremod plugin CodeChickenCorePlugin run successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugin NEICorePlugin

2012-12-29 22:29:26 [iNFO] [sTDOUT] Adding Accesstransformer map: nei_at.cfg

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Coremod plugin NEICorePlugin run successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Running coremod plugin TreeCapitatorCorePlugin

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Coremod plugin TreeCapitatorCorePlugin run successfully

2012-12-29 22:29:26 [FINEST] [ForgeModLoader] Validating minecraft

2012-12-29 22:29:27 [FINEST] [ForgeModLoader] Minecraft validated, launching...

2012-12-29 22:29:27 [iNFO] [sTDOUT] Inserted super call into avz.c

2012-12-29 22:29:27 [iNFO] [sTDOUT] avf was overriden from NotEnoughItems 1.4.4.0.jar

2012-12-29 22:29:27 [iNFO] [sTDERR] Exception thrown while initializing MineCraft.

2012-12-29 22:29:27 [iNFO] [sTDERR] java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher

2012-12-29 22:29:27 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:269)

2012-12-29 22:29:27 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)

2012-12-29 22:29:27 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2012-12-29 22:29:27 [iNFO] [sTDERR] at org.spoutcraft.launcher.MinecraftAppletEnglober.init(MinecraftAppletEnglober.java:110)

2012-12-29 22:29:27 [iNFO] [sTDERR] at org.spoutcraft.launcher.gui.LauncherFrame.runGame(LauncherFrame.java:121)

2012-12-29 22:29:27 [iNFO] [sTDERR] at org.spoutcraft.launcher.gui.LoginForm.runGame(LoginForm.java:907)

2012-12-29 22:29:27 [iNFO] [sTDERR] at org.spoutcraft.launcher.gui.LoginForm$3.done(LoginForm.java:841)

2012-12-29 22:29:27 [iNFO] [sTDERR] at javax.swing.SwingWorker$5.run(SwingWorker.java:717)

2012-12-29 22:29:27 [iNFO] [sTDERR] at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:814)

2012-12-29 22:29:27 [iNFO] [sTDERR] at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:95)

2012-12-29 22:29:27 [iNFO] [sTDERR] at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:824)

2012-12-29 22:29:27 [iNFO] [sTDERR] at javax.swing.Timer.fireActionPerformed(Timer.java:291)

2012-12-29 22:29:27 [iNFO] [sTDERR] at javax.swing.Timer$DoPostEvent.run(Timer.java:221)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventQueue.access$000(EventQueue.java:85)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventQueue$1.run(EventQueue.java:643)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventQueue$1.run(EventQueue.java:641)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

2012-12-29 22:29:27 [iNFO] [sTDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher

2012-12-29 22:29:27 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159)

2012-12-29 22:29:27 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:254)

2012-12-29 22:29:27 [iNFO] [sTDERR] ... 26 more

2012-12-29 22:29:27 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

2012-12-29 22:29:27 [iNFO] [sTDERR] at org.spoutcraft.launcher.MinecraftClassLoader.findClass(MinecraftClassLoader.java:64)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method)

2012-12-29 22:29:27 [iNFO] [sTDERR] at java.lang.Class.forName(Class.java:247)

2012-12-29 22:29:27 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151)

2012-12-29 22:29:27 [iNFO] [sTDERR] ... 27 more

[WIzard_Gorlock]

I am having this same problem and its driving me crazy!!!!! I have a windows computer though. it always says fml is trying to make changes then they all fail.

[covertstranger]

I don't Know why it happens but try using the Jar launcher. I am using MAC and I deleted both my minecraft and technic launcher folder then redownloaded both. (DL the jar launcher) then it started working for me.