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Quote from Sebbie774»

can someone help me?

my forge is unable to launch (hence the title) and I've tried almost everything:

- deleting the entire .minecraft folder

- re-downloading and re-installing forge

- using jre7u11; jre8u25 ; jre7u71 and jre7u55

- uninstalling and re-installing java

is there something i haven't tried?

Here's the log and unfortunately my PC is in Spanish but i think the context should make the Spanish parts self explanatory:

ene 19, 2015 1:17:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMACIÓN: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
ene 19, 2015 1:17:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMACIÓN: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
ene 19, 2015 1:17:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMACIÓN: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
2015-01-19 13:17:47 [INFORMACIÓN] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2015-01-19 13:17:47 [INFORMACIÓN] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25
2015-01-19 13:17:47 [ADVERTENCIA] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-01-19 13:17:49 [ADVERTENCIA] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.6.4_HD_U_D1.jar
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweaker shadersmodcore.loading.SMCTweaker from ShadersModCore-v2.2.3-mc1.6.4-f965.jar
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweak class name optifine.OptiFineForgeTweaker
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweak class name shadersmodcore.loading.SMCTweaker
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2015-01-19 13:17:49 [INFORMACIÓN] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-01-19 13:17:49 [GRAVE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.remove(ArrayList.java:865)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

any and all help will be INSANELY appreciated.