Database connection failed!

Error Message: Unable to connect to the database. Main connection [MySQLi]: Too many connections
File: /var/www/system/Database/BaseConnection.php
Line: 427
Trace:

#0 /var/www/Modules/ProjectSpecific/Modules/Homepage/Controllers/Homepage.php(148): CodeIgniter\Database\BaseConnection->initialize()
#1 /var/www/Modules/ProjectSpecific/Modules/Homepage/Controllers/Homepage.php(34): Modules\ProjectSpecific\Modules\Homepage\Controllers\Homepage->dbTest()
#2 /var/www/system/CodeIgniter.php(906): Modules\ProjectSpecific\Modules\Homepage\Controllers\Homepage->__construct()
#3 /var/www/system/CodeIgniter.php(490): CodeIgniter\CodeIgniter->createController()
#4 /var/www/system/CodeIgniter.php(368): CodeIgniter\CodeIgniter->handleRequest(NULL, Object(Config\Cache), false)
#5 /var/www/html/index.php(111): CodeIgniter\CodeIgniter->run()
#6 {main}