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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 moreCaused 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] ... 7 moreCaused 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:?] ... 9 more