Call to a member function element() on a non-object

I use the CakeGrid plugin,but I met some problems.

this is the error log:

2012-07-05 15:13:26 Error: Fatal Error (1): Call to a member function element() on a non-object in [G:\htdocs\cakedemo\app\Plugin\CakeGrid\View\Helper\GridHelper.php, line 178]

2012-07-05 15:13:26 Error: [FatalErrorException] Call to a member function element() on a non-object

#0 G:\htdocs\cakedemo\lib\Cake\Error\ErrorHandler.php(162): ErrorHandler::handleFatalError(1, 'Call to a membe...', 'G:\htdocs\caked...', 178)

#1 [internal function]: ErrorHandler::handleError(1, 'Call to a membe...', 'G:\htdocs\caked...', 178, Array)

#2 G:\htdocs\cakedemo\lib\Cake\Core\App.php(924): call_user_func('ErrorHandler::h...', 1, 'Call to a membe...', 'G:\htdocs\caked...', 178, Array)

#3 G:\htdocs\cakedemo\lib\Cake\Core\App.php(897): App::_checkFatalError()

my Controller:

<?php

App::uses('AppController','Controller');

class GeneralsController extends AppController{

   var $helpers = array('CakeGrid.Grid');

public function apply(){

$this->set('name','general.apply');

}

public function mid(){

$this->set('name','general.mid');

}

public function end(){

$this->set('name','general.end');

}

}

my View: (apply.ctp)

<h1> <?php echo $name; 

echo '<br>';

echo __('Role');

$this->Grid->addColumn('Order Id', '/Order/id');

$this->Grid->addColumn('Order Date', '/Order/created', array('type' => 'date'));

$this->Grid->addColumn('Order Amount', '/Order/amount', array('type' => 'money'));

$this->Grid->addAction('Edit', array('controller' => 'orders', 'action' => 'edit'), array('/Order/id'));

debug( $this->Grid);

echo $this->Grid->generate($results);

?> </h1>

the GridHelper.php

function generate($results){

//$View = $this->__view();

$View=&ClassRegistry::getObject('view');

$directory = $this->__settings['type'];

if($this->__settings['type'] == 'csv' && !empty($this->__totals)){

array_unshift($this->__columns, array(

'title' => '',

'valuePath' => '',

'options' => array(

'type' => 'empty'

)

));

}

//-- Build the columns

$headers = $View->element($this->elemDir . DS . 'grid_headers',array(             //line 178 :the error occurs

'plugin'  => $this->plugin_name, 

'headers' => $this->__columns,

'options' => $this->__settings

));

$results = $this->results($results);

$generated = $View->element($this->elemDir . DS . 'grid_full', array(

'plugin'  => $this->plugin_name,

'headers' => $headers,

'results' => $results,

'options' => $this->__settings

));

return $generated;

}

 anyone help me,Thanks!

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