GitHub

ERROR FOR LOAD plugin

[17:32:23 WARN]: org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: ac/grim/grimac/platform/bukkit/GrimACBukkitLoaderPlugin has been ...
GitHub

MultiMC Not Launching New Version 1.17, or Many of the Previous Snapshots

Exception in thread "main" java.lang.UnsupportedClassVersionError: net/minecraft/client/main/Main has been compiled by a more recent version of the Java Runtime ...