Warning: mysqli_connect(): (28000/1045): Access denied for user 'root'@'localhost' (using password: NO) in /home/sp-group01/takabaminori.jp/public_html/lib/dbconfig.php on line 16

Warning: mysqli_error() expects parameter 1 to be mysqli, bool given in /home/sp-group01/takabaminori.jp/public_html/lib/dbconfig.php on line 16
I cannot connect to the database because: