Warning: mysqli::__construct(): (HY000/1040): Too many connections in /var/www/html/system/library/db/mysqli.php on line 7

Fatal error: Uncaught Error: Call to undefined function DB\mysql_error() in /var/www/html/system/library/db/mysqli.php:10 Stack trace: #0 /var/www/html/system/library/db.php(9): DB\MySQLi->__construct('localhost', 'root', '4C7kS;=+K'Xe', 'db_ods_cn', '3306') #1 /var/www/html/system/framework.php(25): DB->__construct('mysqli', 'localhost', 'root', '4C7kS;=+K'Xe', 'db_ods_cn', '3306') #2 /var/www/html/index.php(26): require_once('/var/www/html/s...') #3 {main} thrown in /var/www/html/system/library/db/mysqli.php on line 10