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: 5.3.10-1ubuntu3.10
Date: 22.10.2018 @ 09:00
Script: /bb/galerie_index.php?action=portal&sid=4305f98da65465727289a3293067b2ea
Referer: