Undefined index: delta_ui_theme_settings_config in drupal_retrieve_form() (line 736 of includes\form.inc).

Hi!
When i try open settings section in Delta i get next error message.

Notice: Undefined index: delta_ui_theme_settings_config in drupal_retrieve_form() (line 736 of htdocs\gw\includes\form.inc).
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'delta_ui_theme_settings_config' was given in drupal_retrieve_form() (line 771 of htdocs\gw\includes\form.inc).

in file delta_ui.module have

$items['admin/appearance/delta/settings'] = array(
    'title' => 'Settings',
    'description' => 'Manage Delta settings.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('delta_ui_theme_settings_config'),
    'access arguments' => array('administer delta'),
    'file' => 'delta_ui.admin.inc',
    'type' => MENU_LOCAL_TASK,
  );  

but file delta_ui.admin.inc don't have "delta_ui_theme_settings_config" function.

Please take a look.
Thanks, Arsen.