Fatal error: Uncaught PDOException: could not find driver in C:\PDO\classes\Categoria.php:12 Stack trace: #0 C:\PDO\classes\Categoria.php(12): PDO->__construct('mysql:host=127....', 'root', '') #1 C:\PDO\categorias.php(4): Categoria->listar() #2 {main} thrown in C:\PDO\classes\Categoria.php on line 12