Forge ne se lance pas

Hey salut ! J'ai eu mon ordi de réparé (complètement réinitialisé) et Minecraft 1.8 marche parfaitement, mais forge 1.7.2 (blabla pleins de chiffres derrière) ne veut pas se lancer, aucuns message d'erreur et quand je laisse le launcher ouvert ça me met :

[17:59:53] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[17:59:53] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[17:59:53] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[17:59:53] [main/INFO] [FML]: Forge Mod Loader version 7.2.217.1147 for Minecraft 1.7.2 loading
[17:59:53] [main/INFO] [FML]: Java is Java HotSpot(TM) Client VM, version 1.8.0_25, running on Windows 7:x86:6.1, installed at C:\Program Files\Java\jre1.8.0_25
[17:59:53] [main/WARN] [FML]: The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[17:59:53] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.7.2_HD_U_C2.jar
[17:59:53] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:59:53] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
[17:59:53] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[17:59:53] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[17:59:53] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Ensuite plus rien. Forge ne veut pas se lancer tandis que 1.8 accepte totalement. Aidez-moi si possible, merci :) !

 

Tu es un génie, merci beaucoup, rapide ! Carglass !