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: 23.04.2024 @ 06:18
Script: /board/formmail.php?userid=1&sid=b6dc769e42dd125211bd95230ebb70d4
Referer: