Description

Does that mean that I have an outdated version of java or something?

Game Logs

[main/ERROR] [net.minecraftforge.fml.loading.LanguageLoadingProvider/LOADING]: Missing language javafml version [46,47] wanted by ShoulderSurfing-Forge-1.20.1-2.9.1.jar, found 47.2

Thanks for the report. A new version will be available shortly.