Problem loading through modpack

[paintape]

2013-04-02 23:20:51 [iNFO] [sTDERR] java.lang.RuntimeException: java.lang.NoClassDefFoundError: codechicken/core/asm/CodeChickenCorePlugin

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at net.minecraft.Launcher.init(Launcher.java:127)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.spoutcraft.launcher.GameLauncher.runGame(GameLauncher.java:210)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.spoutcraft.launcher.GameUpdater.runGame(GameUpdater.java:136)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.spoutcraft.launcher.skin.components.LoginFrame.onEvent(LoginFrame.java:309)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.spoutcraft.launcher.skin.components.LoginWorker.doInBackground(LoginWorker.java:103)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.util.concurrent.FutureTask.run(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at org.jdesktop.swingworker.SwingWorker.run(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.lang.Thread.run(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR] Caused by: java.lang.NoClassDefFoundError: codechicken/core/asm/CodeChickenCorePlugin

2013-04-02 23:20:51 [iNFO] [sTDERR]    at codechicken.nei.asm.NEICorePlugin.getASMTransformerClass(NEICorePlugin.java:24)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:267)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

2013-04-02 23:20:51 [iNFO] [sTDERR]    ... 15 more

2013-04-02 23:20:51 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: codechicken.core.asm.CodeChickenCorePlugin

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.lang.ClassLoader.loadClass(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    at java.lang.ClassLoader.loadClass(Unknown Source)

2013-04-02 23:20:51 [iNFO] [sTDERR]    ... 18 more

2013-04-02 23:20:51 [iNFO] [sTDERR] Caused by: java.lang.NullPointerException

2013-04-02 23:20:51 [iNFO] [sTDERR]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:200)

2013-04-02 23:20:51 [iNFO] [sTDERR]    ... 20 more

2013-04-02 23:20:57 [iNFO] [sTDOUT] Exiting mod pack

Got this halfway through loading my test modpack...any thoughts? As far as I can see it has something to do with CodeChickenCore, but I don't know what to do. Any ideas are welcome. :/