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 @ 23:53
Script: /board/formmail.php?userid=29&sid=017e8cbd3a5f8c355a2a52d807f6bb94
Referer: