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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(ClassLoader.java:763)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)	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.forName0(Native Method)	at java.lang.Class.forName(Class.java:348)	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(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:348)	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(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at net.minecraft.block.Block.func_149671_p(Block.java:222)	at net.minecraft.init.Bootstrap.func_151354_b(SourceFile:355)	at net.minecraft.server.MinecraftServer.main(MinecraftServer.java:1260)	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:498)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)	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:498)	at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:43)	at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)