Minecraft Forge won't launch, just disappears? (last word below is realease)?

[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