Minecraft Forums

My son has not been able to load Minecraft Forge 1.7.10 for the last week or so, I have tried all the simple things I could but am having no luck. I checked the box to stay open and will paste the results below:

[13:41:05] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[13:41:05] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[13:41:05] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[13:41:06] [main/INFO] [FML]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[13:41:06] [main/INFO] [FML]: Java is Java HotSpot(TM) Client VM, version 1.8.0_40, running on Windows 7:x86:6.1, installed at C:\Program Files\Java\jre1.8.0_40
[13:41:06] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[13:41:06] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[13:41:06] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[13:41:06] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_40]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_40]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Any help is greatly appreciated!

Thanks,

Jeremy

Try the Legacy Java Fixer Mod or try updating your Java. That's where most of these errors come from.