why am I getting this "undefined index" error?

[Luke]

I am trying to set up associations between my orders model and my
orderitems model. It seems to be working except for this error I'm
getting. What am I doing wrong? (see screenshot below)

Here are my models:

<?php
class OrderItem extends AppModel {
   var $name = 'OrderItem';
   var $belongsTo = array('Order' =>
                           array('className'  => 'Order',
                                 'foreignKey' => 'order_id'
                           )
                     );
}
?>

<?php
class Order extends AppModel {
   var $name = 'Order';

   var $hasMany = array('OrderItem' =>
                         array('className'     => 'OrderItem',
                               'order'         => 'OrderItem.status_id
DESC',
                               'foreignKey'    => 'order_id',
                               'dependent'     => true
                         )
                  );
}
?>

here is a screenshot of the error I am getting:

http://pleaseproof.com/luke/cake.gif
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