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java.lang.NullPointerException: 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.Class.getDeclaredFields0(Native Method)	at java.lang.Class.privateGetDeclaredFields(Class.java:2575)	at java.lang.Class.getField0(Class.java:2967)	at java.lang.Class.getField(Class.java:1693)	at cpw.mods.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:277)	at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:192)	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)	at net.minecraft.client.main.Main.main(SourceFile:148)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)