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 @ 03:24
Script: /calendar.php?sid=ed8c6a4295c568d7fbf033b25b781d1c
Referer: