Hello,
I am creating a subtheme but am getting this error:

* Notice: Undefined index: preface_one in jackson_preprocess_page() (line 7 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: preface_two in jackson_preprocess_page() (line 7 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: preface_three in jackson_preprocess_page() (line 7 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: bottom_one in jackson_preprocess_page() (line 8 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: bottom_two in jackson_preprocess_page() (line 8 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: bottom_three in jackson_preprocess_page() (line 8 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).
* Notice: Undefined index: bottom_four in jackson_preprocess_page() (line 8 of /Users/ewilliams/Desktop/drupal-7.0/sites/all/themes/jackson/template.php).

any ideas how to fix this?
Thanks!