Mythicmobs stopped working after I got the Multiverse Core Plugin

[Epicwater]

So basically Mythicmobs was working fine before and was spawning mobs but after getting Multiverse installed, none of the mobs will spawn and the game thinks that there are no mobs to spawn and the default example mythic mobs are gone too. I couldn't find a solution on google so does anyone know how to fix this?

[Echology]

https://www.mythicmobs.net/index.php?threads/solved-how-do-i-fix-my-random-spawning-issues-no-custom-mobs-will-random-spawn.3972/

a quick google search found this, read through this.
https://www.spigotmc.org/threads/mythicmobs-no-mobs-are-spawning.325495/