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Warning: mysqli_connect(): (HY000/1045): Access denied for user 'yukasato'@'localhost' (using password: YES) in /var/www/html/MyLibrary/DB.php on line 31

Fatal error: Uncaught TypeError: mysqli_error(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/html/MyLibrary/DB.php:31 Stack trace: #0 /var/www/html/MyLibrary/DB.php(31): mysqli_error() #1 /var/www/html/MyLibrary/DB.php(25): DB->db_connect() #2 /var/www/html/quest/init.php(81): DB->__construct() #3 /var/www/html/quest/quest_create_user.php(2): require_once('...') #4 {main} thrown in /var/www/html/MyLibrary/DB.php on line 31