Warning: mysqli_connect(): (HY000/1045): Access denied for user 'U2448234'@'keyaira.swh.1u1.it' (using password: YES) in /mnt/web006/b2/98/56988898/htdocs/pages/includes/header.php on line 6

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in /mnt/web006/b2/98/56988898/htdocs/pages/includes/header.php:7
Stack trace:
#0 /mnt/web006/b2/98/56988898/htdocs/pages/includes/header.php(7): mysqli_query()
#1 /mnt/web006/b2/98/56988898/htdocs/index.php(2): include('...')
#2 {main}
  thrown in /mnt/web006/b2/98/56988898/htdocs/pages/includes/header.php on line 7