ModangerBoy

[sOLVED] Install Java 7 2. Start up the minecraft launcher 3. Go to edit profile 4. Click the checkbox that says Executable 5. Delete the words in that box and paste in this: C:\Program Files (x86)\Java\Jre7\bin\javaw.exe [Things to note] Under "Program Files (x86)" the Java folder should have both verisons of java 8 (to run normal minecraft) and java 7 (to run the forge) - When you edit your profile in the minecraft launcher, make sure "C:\Program Files (x86)\Java\Jre7\bin\javaw.exe" is linked up to java 7... Or else it will be on java 8... This causes minecraft to load up, and immediately crash.

[22:33:35] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker [22:33:35] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker [22:33:35] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker [22:33:35] [main/INFO] [FML]: Forge Mod Loader version 7.2.125.1034 for Minecraft 1.7.2 loading [22:33:35] [main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0_31, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_31 [22:33:35] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [22:33:35] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker [22:33:35] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [22:33:35] [main/ERROR] [LaunchWrapper]: Unable to launch java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_31] at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_31] 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:?] Picked up _JAVA_OPTIONS: -Xmx4G -Xms2G Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release This is what I get after I try to run Forge on minecraft.