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 @ 15:22
Script: /board/register.php?sid=b3baf3a9f9c71095ae5f806ae80a60c6
Referer: