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: 25.04.2024 @ 05:56
Script: /board/formmail.php?userid=1&sid=b140e4efa2b0a84478d27b3b54b580e7
Referer: