It's fixed.

[medu1122]

Hello everyone,

I'm currently setting up an RPG server and encountered an issue when running MMOCore together with MythicLib on Paper 1.21.4.

Server Information​

• Server Software: Paper 1.21.4
• Java Version: Java 21
• MMOCore: 1.13.1-SNAPSHOT
• MythicLib: 1.7.1-188 (dev build)

Installed Plugins​

• PlaceholderAPI
• ProtocolLib

Problem Description​

MythicLib loads successfully, but MMOCore fails to enable during server startup.

The plugin appears to initialize normally at first, then stops with a skill registration error.

Console Output​

Particle Warnings​

[MythicLib] Could not load mechanic 'particle{particle=POOF...}'
No enum constant org.bukkit.Particle.POOF

[MythicLib] Could not load mechanic 'particle{particle=TOTEM_OF_UNDYING...}'
No enum constant org.bukkit.Particle.TOTEM_OF_UNDYING

Missing Built-in Skills​

Could not load skill 'AMBERS'
Could not load skill 'NEPTUNE_GIFT'
Could not load skill 'SNEAKY_PICKY'

Main Error​

Error occurred while enabling MMOCore v1.13.1-SNAPSHOT
java.lang.IllegalArgumentException: A skill with the same name already exists
at io.lumine.mythic.lib.manager.SkillManager.registerSkillHandler

---

What I Already Tried​

• Deleted MMOCore and MythicLib config folders and regenerated them
• Restarted server with only dependencies installed
• Confirmed MythicLib loads before MMOCore
• Running Java 21

Thank you!

 

[prosciuttoh]

use the latest stable version for both plugin, aviod dev release or snapshot