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Hello guys, i have a problem... Someone can tell what happened?

Cliente> [11:26:36] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
Cliente> [11:26:37] [main/INFO] [FML]: Forge Mod Loader version 7.2.129.1047 for Minecraft 1.7.2 loading
Cliente> [11:26:37] [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 (x86)\Java\jre1.8.0_25
Cliente> [11:26:37] [main/WARN] [FML]: The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Cliente> [11:26:37] [main/WARN] [FML]: The coremod mariculture.fishery.VanillaOverride does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Cliente> [11:26:37] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.7.2_HD_U_D1.jar
Cliente> [11:26:37] [main/WARN] [FML]: The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Cliente> [11:26:37] [main/INFO] [TCorestruct]: Scalpel. Suction. Lumber axe. CLEAR! *zap*
Cliente> [11:26:37] [main/INFO] [TCorestruct]: Constructing preloader (Modules: [tconstruct.preloader.ASMInterfaceRepair, tconstruct.preloader.AccessTransformers])
Cliente> [11:26:37] [main/INFO] [TCorestruct]: Found a properties file. Attempting load...
Cliente> [11:26:37] [main/INFO] [TCorestruct]: Loaded properties successfully. Using specified settings.
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
Cliente> [11:26:37] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
Cliente> [11:26:37] [main/ERROR] [LaunchWrapper]: Unable to launch
Cliente> java.util.ConcurrentModificationException
Cliente> at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]
Cliente> at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]
Cliente> at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
Cliente> at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
El juego termino sin problemas detectados (exit code 0)
Borrando C:\Users\BurntBiscuits\AppData\Roaming\MC\MultiMinecraft2\Instancias\1\.minecraft\versions\Modpack 21 - (1.7.2)\Modpack 21 - (1.7.2)-natives-6754863063881

Peace.

From my knowledge, ForgeModLoader is incompatible with Java 8

Try switching back to Java 7

As I download the version 7 of Java? On page only appears on the version 8

Download according to your operating system from here:

http://www.java.com/en/download/manual_java7.jsp

EDIT: Don't forget to uninstall Java 8 first from Control Panel

I unistall Java 8 and Install Java 7, but when i try to open the minecraft launcher give me a sign that says "Java Runtime Environment not found" :C

EDIT: I solve the problem, thanks dude!