Hello, i've just downloaded the latest version of a Bukkit plugin (CustomPlayerModels-Bukkit-0.6.23a) from Modbrinth, but when players are joining the server, i get an error in a console, here are my logs:

Full server log: https://mclo.gs/yJ9przU
Errors: https://mclo.gs/6WAo3bA

Im using: Purpur 1.21.8 (1.21.8-2481-HEAD@8de15d6)
This server (that has error, runs as a part of a Velocity server network), just mentioning it, cos there was smth about:
at io.papermc.reflectionrewriter.runtime.AbstractDefaultRulesReflectionProxy.getDeclaredMethod(AbstractDefaultRulesReflectionProxy.java:95)

I will send additional server info if needed, all the players didn't have a mod installed while joining.