Describe the bug
I downloaded ProtocolLib and added it into my server, after that i got kicking with reason: Disconnected, i didn't got any errors (I only have ProtocolLib in plugins folder)

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
I wanted to join a server

Screenshots
https://gyazo.com/ec25f7d0fe8e81bc4c0cab9632b7570a < screenshot

Version Info
I can't check version, but i installed v3.6.5

Additional context
Add any other context about the problem here.