Crash

[14:48:27] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_25]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_25]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_25]
	at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_25]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 6 more
Caused by: java.lang.ClassFormatError: Duplicate field name&signature in class file net/minecraft/world/World
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_25]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_25]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_25]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
	at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
	... 6 more
Exception in thread "main" [14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25)
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at java.lang.Runtime.exit(Runtime.java:107)
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at java.lang.System.exit(System.java:968)
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[14:48:27] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: 	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)