[fw-mvc] Zend_Form exception when adding decorators to Zend_Form_Element_File

Hello,

I'm using the code below to create file upload boxes, but I am receiving the following error only when I add the element decorators.  The error occurs also if I use $uploadBox->setMultiFile() instead of the for loop.  The decorators I'm using work for my other <input> fields.

Thanks in advance for any suggestions!
Jeremy


Error:
------
Warning: Exception caught by form: "file1" not found by file transfer adapter Stack Trace:
#0 C:\Program Files\wamp\php_include\Zend\File\Transfer\Adapter\Abstract.php(877): Zend_File_Transfer_Adapter_Abstract->_getFiles('file1')
#1 C:\Program Files\wamp\php_include\Zend\Form\Element\File.php(632): Zend_File_Transfer_Adapter_Abstract->getFileInfo('file1')
#2 C:\Program Files\wamp\php_include\Zend\Form\Decorator\ViewHelper.php(205): Zend_Form_Element_File->getValue()
#3 C:\Program Files\wamp\php_include\Zend\Form\Decorator\ViewHelper.php(235): Zend_Form_Decorator_ViewHelper->getValue(Object(Zend_Form_Element_File))
#4 C:\Program Files\wamp\php_include\Zend\Form\Element.php(1911): Zend_Form_Decorator_ViewHelper->render('')
#5 C:\Program Files\wamp\php_include\Zend\Form\Decorator\FormElements.php(100): Zend_Form_Element->render()
#6 C:\Program Files\wamp\php_include\Zend\Form\DisplayGroup.php(875): Zend_Form_Decorator_FormElements->render('')
#7 C:\Program Files\wamp\php_include\Zend\Form\Decorator\FormElements.php(100):
in C:\Program Files\wamp\php_include\Zend\Form.php on line 2616


Code:
-------

class My_Form_UploadTest extends Zend_Form
{
 ...

$displayGroupElements = array();
       
//file upload boxes
for($i = 1; $i <= $this->_numFileBoxes; $i++) {
    $uploadBox = new Zend_Form_Element_File("file$i");
    $uploadBox->setLabel("File #$i");
    $uploadBox->setRequired(true);
    $uploadBox->addValidator('Extension', false, 'jpg,jpeg,tif,tiff,gif,png,tga,psd,pdf,bmp,doc,zip,gz,rar');
    $uploadBox->addValidator('FilesSize', false, 524288000); //max upload size is 500MB
    $uploadBox->setDecorators(array(
        array('ViewHelper', array('escape' => false)),
        array('Description', array('tag' => 'span', 'escape' => false)),
        'Errors',
        array(array('data' => 'HtmlTag'), array('tag' => 'td', 'class' => 'element')),
        array('Label', array('tag' => 'td','escape' => false)),
        array(array('row' => 'HtmlTag'), array('tag' => 'tr')),
        ));

    $this->addElement($uploadBox);
    $displayGroupElements[] = $uploadBox->getName();
}
      
//define display group
$this->addDisplayGroup($displayGroupElements,
    'uploadImageDisplayGroup',   
    array(
        'legend' => 'Upload File(s)'
    )
);

...