foreach和section都会报 Notice: Undefined index

我想问一下，为啥我的就会报警告 foreach和section都会报 Notice: Undefined index: cancelOrder in H:\StudyProgram\wamp\www\SmartyTest\libs\ORG\Smarty\sysplugins\smarty_internal_templatebase.php(165) : eval()'d code on line 32

代码：

controller

<?php

class orderController{

function show(){//控制器的作用是调用模型，并调用视图，将模型产生的数据传递给视图，并让相关视图去显示。

global $view;

//$testModel = new testModel();

//$orderModel = M('order');

//$cancelArray = $orderModel->getCancelOrder();

//$testView = V('test');

//$testView -> display($data);

$cancelArray = array(

         array('objectId' =>1 ,

          'installmentNo' =>2 ),

         array('objectId' =>2 ,

          'installmentNo' =>1 )

);

print_r($cancelArray);

$view ->assign('cancelArray',$cancelArray);

$view ->display('order.tpl');

}

}

?>

tpl

<foreach item=cancelOrder from=$cancelArray >

    {$cancelOrder.objectId}

    {$cancelOrder.installmentNo}

   <br />

</foreach>