Internal Server Error

SQLSTATE[HY000] [1040] Too many connections [/var/www/html/vendor/bcosca/fatfree-core/db/sql.php:548]

[/var/www/html/vendor/bcosca/fatfree-core/db/sql.php:548] PDO->__construct()
[/var/www/html/app/Services/Database/Db.php:18] DB\SQL->__construct()
[/var/www/html/app/Controllers/AbstractController.php:16] App\Services\Database\Db->getConnection()
[/var/www/html/vendor/bcosca/fatfree-core/base.php:1947] ReflectionClass->newInstanceArgs()
[/var/www/html/vendor/bcosca/fatfree-core/base.php:1968] Base->grab()
[/var/www/html/vendor/bcosca/fatfree-core/base.php:1795] Base->call()
[index.php:37] Base->run()