Hello, when I use your plugin this doesn't work, its doing me a mistake and puts the plugin in the plugin list in red !

Minecraft Paper 1.16.5
PermissionEX: https://jenkins.addstar.com.au/job/PermissionsEx/lastSuccessfulBuild/
Bug console report: https://pastebin.com/Yx6xjaUv

Can reproduce, same exact error on Paper 1.12.2, Java 8

EDIT
its a known issue for using Java 8 from project lead, Builds in latter would fix this problem

Hey, so I'm not qualified to answer your question but lemme tell you something real quick, PEX has been discontinued, use LuckPerms instead.