[16:25:35] [main/INFO]: Setting user: Player588
Exception in thread "main" java.lang.ClassCastException: sun.misc.Launcher$AppClassLoader cannot be cast to net.minecraft.launchwrapper.LaunchClassLoader
	at cpw.mods.fml.common.ModClassLoader.<init>(ModClassLoader.java:46)
	at cpw.mods.fml.common.Loader.<init>(Loader.java:181)
	at cpw.mods.fml.common.Loader.instance(Loader.java:160)
	at cpw.mods.fml.common.registry.GameData.addPrefix(GameData.java:901)
	at cpw.mods.fml.common.registry.GameData.register(GameData.java:736)
	at cpw.mods.fml.common.registry.FMLControlledNamespacedRegistry.addObject(FMLControlledNamespacedRegistry.java:117)
	at net.minecraft.block.Block.registerBlocks(Block.java:237)
	at net.minecraft.init.Bootstrap.func_151354_b(Bootstrap.java:457)
	at net.minecraft.client.Minecraft.<init>(Minecraft.java:323)
	at net.minecraft.client.main.Main.main(Main.java:141)