Error while loading please help

[VendaGamer]

18:01:51.554

LibrarianLib ASM

main

Patch result: Success

18:01:51.809

LaunchWrapper

main

Unable to launch java.lang.reflect.InvocationTargetException 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:497) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World at net.minecraft.client.main.Main.main(SourceFile:38) ... 6 more Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more Caused by: java.lang.ClassFormatError: Duplicate interface name in class file net/minecraft/world/World at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ... 9 more

18:01:51.852

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException

18:01:51.853

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)

18:01:51.853

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)

18:01:51.876

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)

18:01:51.877

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971)

18:01:51.877

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)

18:01:51.878

STDERR

main

[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

18:01:52.125

launcher

main

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0

18:01:52.125

monitor

Process Monitor

Process crashed with exit code 1