The placeholders can not be registered. With higher versions

[MaechtigerMatthias]

The placeholders can not be registered.

/papi register Expansion-mcmmo.jar
Failed to register expansion from Expansion-mcmmo.jar

System:
Paper: 1.21.11
Mobarena: 1.09
PlaceholderAPI: 2.11.8

[Nesseley]

What does mcmmo have to do with MobArena? Are you possibly in the wrong github?

[MaechtigerMatthias]

Oh, I just reproduced it wrong for the issue.

Here:

[Nesseley]

Hm, please follow the "Getting Started" step by step here: https://github.com/mobarena/MobArenaPlaceholders
And if you still need help please join the MobArena Discord server :)