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 @ 03:25
Script: /board.php?boardid=29&page=1&daysprune=1000&sortfield=lastposttime&sortorder=ASC&sid=937212957543ac52ffcc14d14a71d079
Referer: