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: 28.03.2024 @ 16:14
Script: /board/register.php?sid=6d79c2eb0ae082e8d16206eb2d02a2c4
Referer: