SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Authentication plugin 'mysql_clear_password' cannot be loaded: plugin not enabled
mysql error number: 2059
mysql version: unknown
php version: 5.6.40
Date: 26.10.2020 @ 14:26
Script: /board.php?boardid=4&page=1&daysprune=100&sortfield=lastposttime&sortorder=ASC
Referer: