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: 5.2.17
Date: 18.08.2018 @ 15:57
Script: /index.php?sid=5b1b6065754251b07d75df6ddcf318ae
Referer: