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 @ 03:51
Script: /thread.php?threadid=3981&page=3&sid=dc2e0b067eba06f35e54ca7f437ba6d5
Referer: