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 @ 08:58
Script: /board/usercp.php?action=addsubscription&boardid=11&sid=90a54c343077ed40b9c99f5eb9c7e677
Referer: