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: 5.2.4-2ubuntu5.18
Date: 30.06.2016 @ 08:51
Script: /wbb2/thread.php?postid=3666947
Referer: