Warning: mysqli_connect(): (HY000/2002): Connection refused in /customers/b/e/5/martinusshop.dk/httpd.www/library/database.php on line 4

Fatal error: Uncaught TypeError: mysqli_error(): Argument #1 ($mysql) must be of type mysqli, bool given in /customers/b/e/5/martinusshop.dk/httpd.www/library/database.php:4
Stack trace:
#0 /customers/b/e/5/martinusshop.dk/httpd.www/library/database.php(4): mysqli_error(false)
#1 /customers/b/e/5/martinusshop.dk/httpd.www/library/config.php(100): require_once('/customers/b/e/...')
#2 /customers/b/e/5/martinusshop.dk/httpd.www/index.php(25): require_once('/customers/b/e/...')
#3 {main}
  thrown in /customers/b/e/5/martinusshop.dk/httpd.www/library/database.php on line 4