DataGrid

Hi all.., i have install pear DataGrid, and running the example <?php require 'Structures/DataGrid.php'; // Instantiate the DataGrid $datagrid =& new Structures_DataGrid(); // Setup your database connection $options = array('dsn' => 'mysql://root:@localhost/cdcol'); // Bind a basic SQL statement as datasource $test = $datagrid->bind('SELECT * FROM cds', $options); // Print binding error if any if (PEAR::isError($test)) { echo $test->getMessage(); } // Print the DataGrid with the default renderer (HTML Table) $test = $datagrid->render(); // Print rendering error if any if (PEAR::isError($test)) { echo "error disini".$test->getMessage(); } ?> but i have an error : "Unknown Renderer driver. Please specify an existing driver". how to solve this error?.. thanks before