Problems with FML in 1.4.6

Hey all I am having a problem with any version of FML installing in Magic Launcher. It always seems to say there is one error and I have no idea how to fix that. Below is the error code can you help me out?

*** MagicMinecraftLauncher 1.0.0 ***

Disable inactive mods

Disabled: ChristmasCraft_2.1.0.jar

2013-01-01 14:05:54 [iNFO] [ForgeModLoader] Forge Mod Loader version 4.6.12.511 for Minecraft 1.4.6 loading

2013-01-01 14:05:54 [iNFO] [ForgeModLoader] Found valid fingerprint for Minecraft Forge. Certificate fingerprint de4cf8a3f3bc15635810044c39240bf96804ea7d

2013-01-01 14:05:59 [iNFO] [sTDOUT] 27 achievements

2013-01-01 14:05:59 [iNFO] [sTDOUT] 210 recipes

2013-01-01 14:05:59 [iNFO] [sTDOUT] Setting user: yungskittlez, 1660131944

2013-01-01 14:05:59 [iNFO] [sTDERR] Client asked for parameter: server

2013-01-01 14:05:59 [iNFO] [sTDOUT] LWJGL Version: 2.4.2

2013-01-01 14:06:01 [iNFO] [ForgeModLoader] Attempting early MinecraftForge initialization

2013-01-01 14:06:01 [iNFO] [sTDOUT] MinecraftForge v6.5.0.471 Initialized

2013-01-01 14:06:01 [iNFO] [ForgeModLoader] MinecraftForge v6.5.0.471 Initialized

2013-01-01 14:06:01 [iNFO] [sTDOUT] Replaced 84 ore recipies

2013-01-01 14:06:01 [iNFO] [ForgeModLoader] Completed early MinecraftForge initialization

2013-01-01 14:06:01 [iNFO] [ForgeModLoader] Searching C:\Users\User\AppData\Roaming\.minecraft\mods for mods

2013-01-01 14:06:02 [iNFO] [ForgeModLoader] Forge Mod Loader has identified 3 mods to load

2013-01-01 14:06:02 [iNFO] [ForgeModLoader] Configured a dormant chunk cache size of 0

2013-01-01 14:06:03 [iNFO] [sTDERR] Exception in thread "Minecraft main thread" java.lang.NoSuchMethodError: jg.a(Lji;)Ljg;

2013-01-01 14:06:03 [iNFO] [sTDERR]    at net.minecraft.client.Minecraft.a(Minecraft.java:425)

2013-01-01 14:06:03 [iNFO] [sTDERR]    at asq.a(SourceFile:56)

2013-01-01 14:06:03 [iNFO] [sTDERR]    at net.minecraft.client.Minecraft.run(Minecraft.java:744)

2013-01-01 14:06:03 [iNFO] [sTDERR]    at java.lang.Thread.run(Unknown Source)