SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Too many connections
mysql error number: 1040
mysql version: unknown
php version: 5.4.45
Date: 23.04.2018 @ 03:32
Script: /board.php?boardid=27&daysprune=1000&sortfield=lastposttime&sortorder=DESC&sid=c0bb839bc6936b1877fadb14ea0b271d&page=4
Referer: