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: 24.04.2024 @ 08:18
Script: /board/register.php?sid=b6e9c8ba6763e56fe6dff580dbb3e7ae
Referer: