Error in php code( building wordpress theme from scratch book) -

i following book building wordpress theme scratch.an options page created through method in wordpress admin panel .there error present due nothing appears inside it.

firsly added functions.php of wordpress:

<?php require_once('theme-options.php'); ?> 

secondly theme-options.php created contains this:

<?php  // create custom plugin settings menu add_action('admin_menu', 'director_create_menu');  function director_create_menu() {   //create new submenu  add_submenu_page( 'themes.php', 'director theme options',   'director options', 'administrator', __file__,   'wptuts_landing_settings_page');   //call register settings function  add_action( 'admin_init', 'director_register_settings' );  }   function director_register_settings() {   //register our settings   register_setting( 'director-settings-group', 'director_facebook' );   register_setting( 'director-settings-group', 'director_twitter' );   register_setting( 'director-settings-group', 'director_rss' );   register_setting( 'director-settings-group', 'director_logo' );  register_setting( 'director-settings-group', 'director_analytics' );   }   function director_settings_page() {    ?>   <div class="wrap">  <h2>director theme settings</h2>    <form id="landingoptions" method="post" action="options.php">  <?php settings_fields( 'director-settings-group' ); ?>   <table class="form-table">    <tr valign="top">   <th scope="row">logo:</th>    <td>     <input type="text" name="director_logo" value="<?php print get_option('director_logo'); ?>"      />    <br/>   </td>   </tr>    <tr valign="top">   <th scope="row">facebook link:</th>   <td>   <input type="text" name="director_facebook"    value="<?php print get_option('director_facebook');    ?>" />   </td>   </tr>   <tr valign="top">    <th scope="row">twitter link:</th>   <td>      <input type="text" name="director_twitter" value="<?php print get_option('director_twitter'); ?>" />     </td>    </tr>     <tr>    <th scope="row">display rss icon:</th>   <td>   <input type="checkbox" name="director_rss" <?php    if(get_option('director_rss') == true){ print     "checked"; } ?> />    </td>    </tr>    <tr>   <th scope="row">google analytics code:</th>   <td>    <textarea name="director_analytics"><?php print    get_option('director_analytics'); ?></textarea>   </td> </tr>   </table>   <p class="submit"> <input type="submit" class="button-primary" value="<?php _e('save changes') ?>" />  </p>   </form> </div>  <?php } ?> 

the director options page created there nothing inside it.

the page should show this: page : please tell me problem , fix it.

i found solution , post else encounters problem.

there no wordpress error.however problem due add_submenu_page call function director_settings_page should called instead of wptuts_landing_settings_page.