Hi, I was going to test a mod with forge but when i click to play the launcher closes and nothing happens . The only thing i did the last days related to java or Minecraft was installing the java JDK v8 ,including in the path variable the route of instalation of java JDK and installing a tool for quick mod develop called Mcreator. The last log:
[21:43:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[21:43:52] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[21:43:52] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[21:43:52] [main/INFO]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[21:43:52] [main/INFO]: Java is Java HotSpot Client VM, version 1.8.0_20, running on Windows 8.1:x86:6.3, installed at C:\Program Files (x86)\Java\jre1.8.0_20
[21:43:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[21:43:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[21:43:52] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[21:43:52] [main/ERROR]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20]
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:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_20]
at magic.launcher.Launcher.main(SourceFile:207) [MagicLauncher_1.2.5.exe:?]
Sorry for my bad English