Warning: mysqli_connect(): (HY000/2002): Connection refused in /var/www/cactofili.org/www/includes/db.php on line 12

Fatal error: Uncaught ArgumentCountError: mysqli_error() expects exactly 1 argument, 0 given in /var/www/cactofili.org/www/includes/db.php:12 Stack trace: #0 /var/www/cactofili.org/www/includes/db.php(12): mysqli_error() #1 /var/www/cactofili.org/www/includes/db-app.php(269): myConnect() #2 /var/www/cactofili.org/www/scheda.php(9): require('...') #3 {main} thrown in /var/www/cactofili.org/www/includes/db.php on line 12