An Odd Error ive never seen before

Client> java.lang.IllegalAccessError: tried to access field ym.c from class net.minecraftforge.common.ForgeHooks

Client> at net.minecraftforge.common.ForgeHooks.initTools(ForgeHooks.java:193)

Client> at net.minecraftforge.common.ForgeHooks.<clinit>(ForgeHooks.java:248)

Client> at java.lang.Class.forName0(Native Method)

Client> at java.lang.Class.forName(Unknown Source)

Client> at ReflectorClass.getTargetClass(ReflectorClass.java:37)

Client> at ReflectorClass.<init>(ReflectorClass.java:17)

Client> at Reflector.<clinit>(Reflector.java:40)

Client> at aui.b(GameSettings.java:2370)

Client> at blk.i(SourceFile:112)

Client> at blk.a(SourceFile:69)

Client> at bjt.a(SimpleReloadableResourceManager.java:110)

Client> at ats.O(SourceFile:324)

Client> at ats.d(SourceFile:599)

Client> at net.minecraft.client.main.Main.main(SourceFile:101)

Client> [OptiFine] (Reflector) Method not pesent: net.minecraftforge.client.ForgeHooksClient.onTextureLoad

Client> java.lang.NoClassDefFoundError: net/minecraft/launchwrapper/LaunchClassLoader

Client> at cpw.mods.fml.common.ModClassLoader.<init>(ModClassLoader.java:46)

Client> at cpw.mods.fml.common.Loader.<init>(Loader.java:183)

Client> at cpw.mods.fml.common.Loader.instance(Loader.java:163)

Client> at cpw.mods.fml.common.FMLCommonHandler.<init>(FMLCommonHandler.java:90)

Client> at cpw.mods.fml.common.FMLCommonHandler.<clinit>(FMLCommonHandler.java:79)

Client> at java.lang.Class.forName0(Native Method)

Client> at java.lang.Class.forName(Unknown Source)

Client> at ReflectorClass.getTargetClass(ReflectorClass.java:37)

Client> at ReflectorClass.<init>(ReflectorClass.java:17)

Client> at Reflector.<clinit>(Reflector.java:62)

Client> at aui.b(GameSettings.java:2370)

Client> at blk.i(SourceFile:112)

Client> at blk.a(SourceFile:69)

Client> at bjt.a(SimpleReloadableResourceManager.java:110)

Client> at ats.O(SourceFile:324)

Client> at ats.d(SourceFile:599)

Client> at net.minecraft.client.main.Main.main(SourceFile:101)

Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.launchwrapper.LaunchClassLoader

Client> at java.net.URLClassLoader$1.run(Unknown Source)

Client> at java.net.URLClassLoader$1.run(Unknown Source)

Client> at java.security.AccessController.doPrivileged(Native Method)

Client> at java.net.URLClassLoader.findClass(Unknown Source)

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

Client> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

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

Client> ... 17 more