rolands1999

I have the same problem. I have tried everything but always when i try to launch minecraft with forge 1.7.2 it closes the launcher but minecraft wont launch. It just closes. And here is my log: [18:52:39] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker [18:52:39] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker [18:52:39] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker [18:52:39] [main/INFO]: Forge Mod Loader version 7.2.59.999 for Minecraft 1.7.2 loading [18:52:39] [main/INFO]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0_20, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_20 [18:52:39] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [18:52:39] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker [18:52:39] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [18:52:39] [main/ERROR]: Unable to launch java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20] at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20] 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:?] Please help!!!