Error log: https://paste.ee/p/uO6dRzmF

Hi,

I am unable to start Minecraft and found out that crash is correlating to Lithostitched.
Launcher is MultiMC 0.7.0
MC version is 1.21.1
NeoForge version 21.1.139
And Lithostitched version lithostitched-neoforge-1.21.1-1.4.5

Everything else are already disabled in the test. So there were only MC, NeoForge and Lithostiched booting up.

Thank you very much!

If that is the issue, I'd advise using prism launcher (A fork of multimc), I say this because it earns you if you are using potentially incompatible java versions. (Not sure if multiMC does too but I know prism does for certain). Iirc Java 21 is recommended.

Very confusing error, it's saying a basic class in Java doesn't exist. Looking into it.

Thanks! Your answer pointed me to Java relevant possibilities.
The crash happened with latest JDK 24, which I did not mention before.
Today I installed JDK 23.0.2 and the crash with Lithostiched no longer happens.