LinFly
In fact, no one has tried to fix or understand this bug so far, which has resulted in me being unable to properly start the server using the Paper plugin....
Received some good news. If you are really in a hurry to use the plugin, you can try the older version v4.4.0 [here](https://github.com/dmulloy2/ProtocolLib/releases/tag/4.4.0). Based on my testing, it can run...
Sorry I couldn't help you, but my problem has been temporarily resolved. Good luck, bro.