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 @ 11:35
Script: /board/formmail.php?userid=29&sid=6b65b5ffb2d3074f2265b2c46f5093d7
Referer: