Forge crashing right after i press play

[Sobber]

so basically i hit play and i get a crash message but no crash report but i went into the logs and pulled out where the error was can someone help me out with finding out what it means

 

[20:08:29] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
    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:38) ~[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_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassFormatError: Duplicate interface name in class file net/minecraft/world/World
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?]
    ... 6 more

[M1st]

yo dude this just happened to me to its weird as hell, its happening all over forge rn

[DavidM]

@Sobber Please post the full log.

@M1st Please make your own thread.