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EU TENHO MINECRAFT ORIGINAL, E INTALEI O FORGE 1.6.4 E QUANDO EU DOU PLAY NÃO FUNCIONA E ESSE É O LOG DO ERRO

dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Java is Java HotSpot(TM) 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
2014-12-09 20:55:48 [ADVERTÊNCIA] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-12-09 20:55:48 [GRAVE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.remove(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Picked up _JAVA_OPTIONS: -Xmx1G
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

NÃO VENHÃO ME FALAR QUE TEM QUE TROCAR AS VARIAVEIS PORQUE EU SEI QUE NÃO E ISSO

English for those wondering:

I HAVE MINECRAFT , AND THEN I INSTALLED FORGE FOR MC 1.6.4 BUT WHEN I CLICK PLAY IT DOESN'T WORK HERE THE LOG:

dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
dez 09, 2014 8:55:47 PM net.minecraft.launchwrapper.LogWrapper log
INFORMAÇÕES: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Java is Java HotSpot(TM) 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
2014-12-09 20:55:48 [ADVERTÊNCIA] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2014-12-09 20:55:48 [INFORMAÇÕES] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-12-09 20:55:48 [GRAVE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.remove(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Picked up _JAVA_OPTIONS: -Xmx1G
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

DON'T SAY THAT I NEED TO CHANCE THE VARIABLES BECAUSE I KNOW THAT I DON'T

something like that
can't awser because i don't understand anything about java :3