Plugin MythicMobs v4.3.2-SNAPSHOT has failed to register events for class io.lumine.xikage.mythicmob

idk what this is
i have tried multi versions and this always pops up in console
and cant use commands in game

this is the error log
null
org.bukkit.command.CommandException: Unhandled exception executing command 'mm' in plugin MythicMobs v4.3.2-SNAPSHOT
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.12.2.jar:git-Bukkit-809c399]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit-1.12.2.jar:git-Bukkit-809c399]...

Plugin MythicMobs v4.3.2-SNAPSHOT has failed to register events for class io.lumine.xikage.mythicmob