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It must be a much harder-to-debug end-of-chain problem 😈Įrase your language's culture (/s), rename your instance DIRECTORIES (not the instances themselves from the contextual menu) so they only contain American© Standardized™ letters How can it be fixed upstream ?

I tried to Ctrl + F in the crash log from MultiMC to see if the instance directory name had had its 'é' stripped somewhere, and no, all paths look fine here.That said, I'm pretty sure that the official launcher stores its libraries and similar stuff in one centralized place, so their path remains clear of any non-ASCII chars. The official Minecraft Launcher does manage to launch the instance, even when the 'Game directory' is set to the MultiMC instance's.This has to do with the directory name, not the instance name, which can differ if the instance is renamed after its creation. Well I still don't know what causes the bug precisely and more importantly why, but I can definitely tell you that the Minecraft instance can be started if its directory name contains strictly ASCII characters, and crashes when it contains an 'é'. Although the world is supposed to use UTF-8 everywhere and even almost not care about the bytes that make up any string, it just happens that in the huge technological stack required to launch Minecraft (MMC, Java, MMC's bootstrap code, Minecraft, LWJGL.) a little rascal misbehaves when exposed to non-English characters, and produces a very unclear – almost unrelated – error that took hours to debug. We use funny-looking dressed-up letters such as this magnificent 'é'. I took a bit of time trying to reproduce the bug on the computer where it worked, and I managed to make Minecraft crash too. I have searched the issue tracker and did not find an issue describing my bug.I have a lot of MultiMC instances, ranging from 1.8 to 1.16.*, modded and vanilla, and they all work (on openjdk8 though). I have no idea, the stack trace is truncated and I don't know why the 'GLFW' class wouldn't load. minecraft/runtime) and it still doesn't work I also tried to use the exact bundled java binary that is shipped with the official Minecraft launcher (inside.Select openjdk16 or oracle jdk 16 (both don't work).Trying to start it with a lower version will result in an error telling us to use a more recent version of Java. This version requires a version of java ≥16.: : at .RenderSystem.getApiDescription(SourceFile:770) : : at .GLX.getOpenGLVersionString(SourceFile:35) : : Caused by: : Could not initialize class

: : at .launchWithMainClass(OneSixLauncher.java:210) : : at java.base/.invoke(Method.java:568) : : at java.base/.invoke(DelegatingMethodAccessorImpl.java:43) : : at java.base/.invoke(NativeMethodAccessorImpl.java:77) : : at java.base/.invoke0(Native Method)

Multimc install forge 1.17.1