[19:36:07] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:36:07] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:36:07] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[19:36:07] [main/INFO] [FML]: Forge Mod Loader version 7.2.217.1147 for Minecraft 1.7.2 loading
[19:36:07] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 8:amd64:6.2, installed at C:\Users\Krystal\Downloadsuntime\jre-x…
[19:36:07] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectio…
[19:36:07] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTwe…
[19:36:07] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectio…
[19:36:07] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationExcepti…
at java.util.ArrayList$Itr.checkForComodifi… ~[?:1.8.0_25]
at java.util.ArrayList$Itr.remove(ArrayList… ~[?:1.8.0_25]
at net.minecraft.launchwrapper.Launch.launc… [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(… [launchwrapper-1.9.jar:?]
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future
Minecraft Forge won't launch, just disappears? (last word below is realease)?
skylar 19.07.2015
If you are using any mods then that could really affect it. (even if the mods hadn't loaded yet) can you list the mods?
Maxon 20.07.2015