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: 18.04.2024 @ 14:03
Script: /board/usercp.php?action=addsubscription&boardid=9&sid=d5a221bb4b0575fc7e97b4482b7861ab
Referer: