I got the same problem
Im running on a windows PC bit, heres the log if anyone wants it
2013-01-04 16:39:29 [iNFO] [ForgeModLoader] Forge Mod Loader version 4.6.17.515 for Minecraft 1.4.6 loading
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Discovering coremods
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Found a candidate coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loading coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loaded coremod [1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.7.0.2.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.7.0.2.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loaded coremod CodeChickenCore 0.7.0.2.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.4.5.0.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.4.5.0.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.4.5.0.jar
2013-01-04 16:39:29 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-2.25.jar
2013-01-04 16:39:29 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-2.25.jar
2013-01-04 16:39:29 [iNFO] [sTDOUT] Request: GET http://files.minecraftforge.net/fmllibs/argo-2.25.jar
2013-01-04 16:39:29 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:39:30 [iNFO] [sTDOUT] Piping finished, data size: 123642
2013-01-04 16:39:30 [FINEST] [ForgeModLoader] Download complete
2013-01-04 16:39:30 [iNFO] [ForgeModLoader] Download complete
2013-01-04 16:39:30 [FINEST] [ForgeModLoader] Library file argo-2.25.jar was downloaded and verified successfully
2013-01-04 16:39:30 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar
2013-01-04 16:39:30 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar
2013-01-04 16:39:30 [iNFO] [sTDOUT] Request: GET http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar
2013-01-04 16:39:30 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:39:49 [iNFO] [sTDOUT] Piping finished, data size: 1795932
2013-01-04 16:39:49 [FINEST] [ForgeModLoader] Download complete
2013-01-04 16:39:49 [iNFO] [ForgeModLoader] Download complete
2013-01-04 16:39:49 [FINEST] [ForgeModLoader] Library file guava-12.0.1.jar was downloaded and verified successfully
2013-01-04 16:39:49 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar
2013-01-04 16:39:49 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar
2013-01-04 16:39:49 [iNFO] [sTDOUT] Request: GET http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar
2013-01-04 16:39:49 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:39:50 [iNFO] [sTDOUT] Piping finished, data size: 212767
2013-01-04 16:39:50 [FINEST] [ForgeModLoader] Download complete
2013-01-04 16:39:50 [iNFO] [ForgeModLoader] Download complete
2013-01-04 16:39:50 [FINEST] [ForgeModLoader] Library file asm-all-4.0.jar was downloaded and verified successfully
2013-01-04 16:39:50 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2013-01-04 16:39:50 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2013-01-04 16:39:50 [iNFO] [sTDOUT] Request: GET http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2013-01-04 16:39:50 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:40:02 [iNFO] [sTDOUT] Piping finished, data size: 1997327
2013-01-04 16:40:02 [FINEST] [ForgeModLoader] Download complete
2013-01-04 16:40:02 [iNFO] [ForgeModLoader] Download complete
2013-01-04 16:40:02 [FINEST] [ForgeModLoader] Library file bcprov-jdk15on-147.jar was downloaded and verified successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugins
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin
2013-01-04 16:40:03 [iNFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Coremod plugin FMLCorePlugin run successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugin FMLForgePlugin
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Coremod plugin FMLForgePlugin run successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugin TreeCapitatorCorePlugin
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Coremod plugin TreeCapitatorCorePlugin run successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugin CodeChickenCorePlugin
2013-01-04 16:40:03 [iNFO] [sTDOUT] Adding Accesstransformer map: codechickencore_at.cfg
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Coremod plugin CodeChickenCorePlugin run successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Running coremod plugin NEICorePlugin
2013-01-04 16:40:03 [iNFO] [sTDOUT] Adding Accesstransformer map: nei_at.cfg
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Coremod plugin NEICorePlugin run successfully
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Validating minecraft
2013-01-04 16:40:03 [FINEST] [ForgeModLoader] Minecraft validated, launching...
2013-01-04 16:40:04 [iNFO] [sTDOUT] Inserted super call into avz.c
2013-01-04 16:40:04 [iNFO] [sTDOUT] avf was overriden from NotEnoughItems 1.4.5.0.jar
2013-01-04 16:40:05 [iNFO] [sTDERR] Exception thrown while initializing MineCraft.
2013-01-04 16:40:05 [iNFO] [sTDERR] java.lang.RuntimeException: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 16:40:05 [iNFO] [sTDERR]at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:269)
2013-01-04 16:40:05 [iNFO] [sTDERR]at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)
2013-01-04 16:40:05 [iNFO] [sTDERR]at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2013-01-04 16:40:05 [iNFO] [sTDERR]at net.minecraft.Launcher.init(Launcher.java:116)
2013-01-04 16:40:05 [iNFO] [sTDERR]at org.spoutcraft.launcher.gui.LauncherFrame.runGame(LauncherFrame.java:135)
2013-01-04 16:40:05 [iNFO] [sTDERR]at org.spoutcraft.launcher.gui.LoginForm.runGame(LoginForm.java:907)
2013-01-04 16:40:05 [iNFO] [sTDERR]at org.spoutcraft.launcher.gui.LoginForm$3.done(LoginForm.java:841)
2013-01-04 16:40:05 [iNFO] [sTDERR]at javax.swing.SwingWorker$5.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at sun.swing.AccumulativeRunnable.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at javax.swing.Timer.fireActionPerformed(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at javax.swing.Timer$DoPostEvent.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.event.InvocationEvent.dispatch(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventQueue.access$000(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventQueue$3.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventQueue$3.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.security.AccessController.doPrivileged(Native Method)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventQueue.dispatchEvent(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.awt.EventDispatchThread.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR] Caused by: cpw.mods.fml.relauncher.ReflectionHelper$UnableToFindClassException: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 16:40:05 [iNFO] [sTDERR]at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:159)
2013-01-04 16:40:05 [iNFO] [sTDERR]at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:254)
2013-01-04 16:40:05 [iNFO] [sTDERR]... 26 more
2013-01-04 16:40:05 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.Launcher
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.net.URLClassLoader$1.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.net.URLClassLoader$1.run(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.security.AccessController.doPrivileged(Native Method)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.net.URLClassLoader.findClass(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at org.spoutcraft.launcher.MinecraftClassLoader.findClass(MinecraftClassLoader.java:64)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.lang.ClassLoader.loadClass(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.lang.ClassLoader.loadClass(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.lang.Class.forName0(Native Method)
2013-01-04 16:40:05 [iNFO] [sTDERR]at java.lang.Class.forName(Unknown Source)
2013-01-04 16:40:05 [iNFO] [sTDERR]at cpw.mods.fml.relauncher.ReflectionHelper.getClass(ReflectionHelper.java:151)
2013-01-04 16:40:05 [iNFO] [sTDERR]... 27 more
2013-01-04 16:42:46 [iNFO] [sTDOUT] Request: HEAD http://206.217.207.1/Technic/tekkit/modpack.yml
2013-01-04 16:42:46 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:42:46 [iNFO] [sTDOUT] Request: GET http://206.217.207.1/Technic/tekkit/modpack.yml
2013-01-04 16:42:46 [iNFO] [sTDOUT] No handler. Piping.
2013-01-04 16:42:46 [iNFO] [sTDOUT] Piping finished, data size: 10396
