Bug-crash démarrage 1.8.9

[Legol4s]

Bonjour,
Depuis 2 jours mon minecraft en 1.8.9 ne se lance plus, voici le message d'erreurma version 1.7.10 et 1.9.4 se lancent sans problème.)

[23:41:23] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[23:41:23] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_111]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_111]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_111]
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:?]
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

[robin4002]

Salut,
Réinstalles forge 1.8.9, un fichier est manquant.