Minecraft Forums

Hello, I am trying to run minecraft 1.6.4 with forge. However, when ever I click launch it downloads for a moment then the minecraft closes. Just like that and nothing happen. I deleted the whole minecraft file and installed forge again, but still the same issue. I hope someone can help me. Thank you

I've had this issue before, I think it means that your mods are incompatible.

I have no mods installed. I only want to run minecraft with forge

Quote from maokee»

I have no mods installed. I only want to run minecraft with forge

Okay, sorry, can't help you there.

Thank you for your concern

Does it give you an error report? You should get one in your launcher when it crashes. If your launcher doesn't open after crashing click "Edit Profile" and change launcher visibility to reopen when the game closes.

Did you try turning it off and on again?

Quote from FritzC95»

Does it give you an error report? You should get one in your launcher when it crashes. If your launcher doesn't open after crashing click "Edit Profile" and change launcher visibility to reopen when the game closes.

Thank you. I don't know if this help, but I guess this is what you are asking for
( Iam sorry i don't know how to put it in spoiler or something )

Nov 09, 2014 3:04:57 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Nov 09, 2014 3:04:58 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Nov 09, 2014 3:04:58 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
2014-11-09 03:04:58 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2014-11-09 03:04:58 [INFO] [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\Java\jre1.8.0_25
2014-11-09 03:04:58 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-11-09 03:04:58 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2014-11-09 03:04:58 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-11-09 03:04:58 [SEVERE] [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)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Quote from grimallq»

Get rid of Java 8.

or

Configure Minecraft to use Java 7 (if you have it installed)

or

Install Forge patch from Forge forums EAQ thread.

Thank you. It worked =D
I deleted Java 8 and it worked