Today i decided to update my private modpack to 1.16.4 since most mods had a working build for that version, i createad a new world to do some troubleshooting and verify if everything was working as ...

at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:71) [?:?] {re:classloading} at net.minecraftforge.fml.client ...