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java.lang.ClassFormatError: Duplicate method name&signature in class file net/minecraft/block/BlockLeavesBase	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(Unknown Source)	at java.security.SecureClassLoader.defineClass(Unknown Source)	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Unknown Source)	at cofh.asm.CoFHAccessTransformer.transform(CoFHAccessTransformer.java:90)	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Unknown Source)	at cofh.asm.CoFHAccessTransformer.transform(CoFHAccessTransformer.java:90)	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at net.minecraft.block.Block.func_149671_p(Block.java:222)	at net.minecraft.init.Bootstrap.func_151354_b(SourceFile:355)	at net.minecraft.client.Minecraft.(Minecraft.java:287)	at net.minecraft.client.main.Main.main(SourceFile:129)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)