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 @ 02:20
Script: /board/usercp.php?action=buddy&add=3&sid=99c14b81c855d1a525081eb9e0ff2b87
Referer: