Fatal error: Uncaught mysqli_sql_exception: Unknown database 'northwind' in C:\xampp\htdocs\BK\bateriasec\public\jqx\demos\PHP\server_side_grid__with_nested_grids\data.php:7 Stack trace: #0 C:\xampp\htdocs\BK\bateriasec\public\jqx\demos\PHP\server_side_grid__with_nested_grids\data.php(7): mysqli->__construct('localhost', 'root', '', 'northwind') #1 {main} thrown in C:\xampp\htdocs\BK\bateriasec\public\jqx\demos\PHP\server_side_grid__with_nested_grids\data.php on line 7