SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Link-ID == false, connect failed
mysql error: The server requested authentication method unknown to the client
mysql error number: 2054
Date: 20.04.2024 @ 00:06
Script: /board/register.php?sid=c6a9bc356d2c2f3ab3a9dec5e27807fe
Referer: