Codeigniter模板库不在现场主机上工作

I have codeigniter project on a live server and i failed to load view using template, this is the code:

$this->template->load('Template', 'view_admin');

and this is the library:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Template {
    var $template_data = array();

    function set($name, $value)
    {
        $this->template_data[$name] = $value;
    }

    function load($template = '', $view = '' , $view_data = array(), $return = FALSE)
    {
        $this->CI =& get_instance();
        $this->set('contents', $this->CI->load->view($view, $view_data, TRUE));
        return $this->CI->load->view($template, $this->template_data, $return);
    }
}

/* End of file Template.php */
/* Location: ./system/application/libraries/Template.php */

and i already called the library in autoload file

$autoload['libraries'] = array('session', 'database', 'template');

but the result is just a blank page, showing nothing

before i moved into live server, it's already works well on a localhost.

so, what i missed? Thanks in advanced