[23:30:01] [main/ERROR] [LaunchWrapper/]: Unable to launch
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_21]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_21]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_21]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_21]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_21]
	at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:286) [NewLaunch.jar:?]
	at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:376) [NewLaunch.jar:?]
	at org.multimc.EntryPoint.listen(EntryPoint.java:165) [NewLaunch.jar:?]
	at org.multimc.EntryPoint.main(EntryPoint.java:54) [NewLaunch.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 14 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.11.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 14 more
Caused by: java.lang.ClassFormatError: Duplicate field name&signature in class file net/minecraft/world/World
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_21]
	at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.7.0_21]
	at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.7.0_21]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.11.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 14 more