AuthMe
CMI
CMInjector
vAult
LuckyPerms
Normal play.
This server is running Paper version git-Paper-161 (MC: 1.15.2) (Implementing API version 1.15.2-R0.1-SNAPSHOT)
DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH
Your server is just severely overloaded.
This should be closed.
As stated, this appears to be a bug with your server. Consider running a timings report and letting us know in #paper-help on Discord if you are still experiencing this issue. We also suggest using a Pastebin service so as to not flood the issue description. Thank you for the report!
Most helpful comment
DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASHYour server is just severely overloaded.