Warning: mysqli_connect(): (HY000/1040): Too many connections in /home/kir380030/public_html/esz.jp/common/lib_db.php on line 10

Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /home/kir380030/public_html/esz.jp/common/lib_db.php on line 11
I cannot connect to the database because: