java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.transformers.Deobfusca

heres the error whats fix?

2013-04-30 09:03:43 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.1.43.673 for Minecraft 1.5.1 loading

2013-04-30 09:03:43 [iNFO] [ForgeModLoader] Java is Java HotSpot 64-Bit Server VM, version 1.7.0_07, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre7

2013-04-30 09:03:43 [FINE] [ForgeModLoader] Java classpath at launch is MultiMCLauncher.jar

2013-04-30 09:03:43 [FINE] [ForgeModLoader] Java library path at launch is C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Java\jdk1.7.0_07\bin;.

2013-04-30 09:03:43 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Discovering coremods

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.8.6.3.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.8.6.3.jar

2013-04-30 09:03:43 [WARNING] [ForgeModLoader] The coremod codechicken.core.asm.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loaded coremod CodeChickenCore 0.8.6.3.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found a candidate coremod CoFHCore-1.5.1.2.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loading coremod CoFHCore-1.5.1.2.jar

2013-04-30 09:03:43 [FINE] [ForgeModLoader] The coremod cofh.asm.CoFHPlugin requested minecraft version 1.5.1 and minecraft is 1.5.1. It will be loaded.

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loaded coremod CoFHCore-1.5.1.2.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found a candidate coremod miscperipherals-3.1c-ccbeta.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loading coremod miscperipherals-3.1c-ccbeta.jar

2013-04-30 09:03:43 [WARNING] [ForgeModLoader] The coremod miscperipherals.asm.MiscPeripheralsPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2013-04-30 09:03:43 [iNFO] [MiscPeripheralsASM] Initialized

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loaded coremod miscperipherals-3.1c-ccbeta.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.5.2.10.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.5.2.10.jar

2013-04-30 09:03:43 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.5.2.10.jar

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file guava-14.0-rc3.jar present and correct in lib dir

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file asm-all-4.1.jar present and correct in lib dir

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-148.jar present and correct in lib dir

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.1.zip present and correct in lib dir

2013-04-30 09:03:43 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir

2013-04-30 09:03:44 [sEVERE] [ForgeModLoader] A critical problem occured registering the ASM transformer class cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:122)

at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:278)

at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

at net.minecraft.Launcher.init(Launcher.java:108)

at MCFrame.start(MCFrame.java:72)

at MultiMCLauncher.main(MultiMCLauncher.java:275)

Caused by: java.lang.AbstractMethodError

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:352)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:225)

... 11 more

2013-04-30 09:03:44 [FINEST] [ForgeModLoader] Running coremod plugins

2013-04-30 09:03:44 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin

2013-04-30 09:03:46 [iNFO] [sTDERR] Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:192)

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)

2013-04-30 09:03:46 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-04-30 09:03:46 [iNFO] [sTDERR] at net.minecraft.Launcher.init(Launcher.java:108)

2013-04-30 09:03:46 [iNFO] [sTDERR] at MCFrame.start(MCFrame.java:72)

2013-04-30 09:03:46 [iNFO] [sTDERR] at MultiMCLauncher.main(MultiMCLauncher.java:275)

2013-04-30 09:03:46 [iNFO] [sTDERR] Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:306)

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

2013-04-30 09:03:46 [iNFO] [sTDERR] ... 6 more

2013-04-30 09:03:46 [iNFO] [sTDERR] Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.FMLSanityChecker

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)

2013-04-30 09:03:46 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-04-30 09:03:46 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-04-30 09:03:46 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method)

2013-04-30 09:03:46 [iNFO] [sTDERR] at java.lang.Class.forName(Unknown Source)

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:295)

2013-04-30 09:03:46 [iNFO] [sTDERR] ... 7 more

2013-04-30 09:03:46 [iNFO] [sTDERR] Caused by: java.lang.AbstractMethodError

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:352)

2013-04-30 09:03:46 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:225)

2013-04-30 09:03:46 [iNFO] [sTDERR] ... 12 more

Clean your Coremods folder and try again. Make sure you've updated your mods.