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: 5.6.11-1~dotdeb+7.1
Date: 27.05.2017 @ 06:12
Script: /pms.php?action=newpm&userid=26456
Referer: