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 @ 20:59
Script: /board/formmail.php?userid=29&sid=3eea8206a9a5ae6ec8c78a3dbabe83cc
Referer: