Warning: mysqli_connect(): (HY000/2002): Connection refused in /www/wwwroot/edua.info/settings.php on line 20

Fatal error: Uncaught TypeError: mysqli_set_charset(): Argument #1 ($mysql) must be of type mysqli, bool given in /www/wwwroot/edua.info/settings.php:21 Stack trace: #0 /www/wwwroot/edua.info/settings.php(21): mysqli_set_charset() #1 /www/wwwroot/edua.info/index.php(2): require_once('...') #2 {main} thrown in /www/wwwroot/edua.info/settings.php on line 21