Minecraft forge 1.12 crash :-(

[Bobf814]

My game is for some reason not loading... can i have some help?

 

Operating system: Ubuntu 17.04

Memory: 1.8 GB usable (2.00 GB total)

64-bit

 

Spoiler

OpenJDK 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
[08:40:59] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[08:40:59] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_131]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_131]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[?:1.8.0_131]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_131]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_131]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_131]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_131]
    at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_131]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]

 

 

I'm not sure what is wrong, please help.

Edited August 11, 2017 by Bobf814

[Bobf814]

i installed Forge by using the java installer and i use 1.6.73-j

[Bobf814]

22 hours ago, Bobf814 said:

i installed Forge by using the java installer and i use 1.6.73-j

may someone help please?

[LexManos]

Delete everything and re-install. That file should exist. Unless you're using a broken launcher.