I'm running Paper build #279 and still getting the error on a 1.16.5 world that I updated with --forceUpgrade to 1.17.1, however it doesn't appear to be crashing the server (yet) just generating the console error.
Gary W Gehiere
I'm running Paper build #279 and still getting the error on a 1.16.5 world that I updated with --forceUpgrade to 1.17.1, however it doesn't appear to be crashing the server (yet) just generating the console error.