SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
mysql error number: 2002
Date: 21.05.2024 @ 00:20
Script: /wbb/board.php?boardid=155&sid=5a8b342822eae0e037ee031a0f0e98bb
Referer: http://www.delftseschaaksite.nl/wbb/board.php?boardid=155&sid=5a8b342822eae0e037ee031a0f0e98bb