Some background: I made my own mod by mixing the recommended hexxit (1.5.2) and voltz (1.5.2). Made a server out of it and I’ve been playing with friends and family for a few months. Now I’m hoping to invite friends of friends and I’m cleaning up some of the broken features, so I’m upgrading all mods up to 1.7.2 or dropping them, planning add a few, etc. and actually registering it through the technic launcher so everyone can load it easily.
So I tried making a 1.7.2 mod with only 1 mod installed, made a few mistakes and arrived at this error once I got it (apparently) right. When I press play it closes the launcher briefly then reopens it, during which it attempted to run the mod and failed before any window appeared. Then I tried a forge 1.7.2 template (with no mods installed) and that failed the same way. So I tried downgrading to Java 7 based on some research into similar problems. Didn’t help so I reverted, now I’m back to Java 1.8.0_25.
Then I got to thinking, I haven’t had anything from the technic launcher work that’s on version 1.7.2. Maybe its that? All versions of vanilla minecraft (including 1.7.2) have worked without issue since the error started. In my mind its narrowed down to forge 1.7.2 as the problem and I don’t know where to go from here.
Here’s the log produced at .technicmodpacksmymodpacklogslatest.log
[18:08:45] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker [18:08:45] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker [18:08:45] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker [18:08:45] [main/INFO]: Forge Mod Loader version 18.104.22.1687 for Minecraft 1.7.2 loading [18:08:45] [main/INFO]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at E:Program FilesJavajre1.8.0_25 [18:08:45] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [18:08:45] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker [18:08:45] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [18:08:45] [main/ERROR]: Unable to launch java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25] at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25] 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:?]
How do I make this work or should I just avoid 1.7.2? I’m out of ideas.