Fatal error: Cannot use object of type stdClass as array in

Hi,

I got this error message.
‘Fatal error: Cannot use object of type stdClass as array in’

I create custom table in wordpress database.
‘wp_directory’

and here is the code

<?php
$results = $wpdb->get_results( "SELECT id, name, address FROM wp_directory" );
//echo "<pre>"; print_r($results); echo "</pre>";
if ($results) {
  foreach ($results as $Row){
    echo $Row['id'];
    echo $Row['name'];
    echo $Row['address'];
  }  // foreach
} // if $results
?>

please help me.
Thanks