YII WHEELS - File upload widget

I´m trying to use WhFileUpload widget as follow:

view:




<?php

$this->widget(

    'yiiwheels.widgets.fileupload.WhFileUpload',

    array(

        'name'     => 'fileuploadui',

        'url'      => $this->createUrl('site/upload')),

        'multiple' => true,

    )

);

?>



SiteController.php




public function actions()

	{

		return array(

		        'upload' => array(

				'class'=>'ext.UploadHandler', // taken from Jquery File Upload site

			),


		);

	}


}



After I start the upload, then returns "syntax error - unexpected token …"

What am I doing wrong?

Thanks in advance