Spawners not working

Summary

When trying to use the "/mm spawners create" or basically any command associated with spawners gives the same error "An internal error occurred while attempting to perform this command"

Steps to reproduce

I can't use some of Myticmobs commands these are the commands that are not working https://pastebin.com/e49BGJNf

Current behavior

I can't spawn mobs I need to spawn it manually, there is no big effect other then

Intended correct behavior

spawn the mob at the dedicated coordinates and world, and use the spawner commands

Server log file

https://pastebin.com/tmpRGY52

Debug log snippet

https://pastebin.com/LBJW1bqu

Proposed fixes

fix the commands somehow.