加载模型导致空白/白屏CodeIgniter 2.0.3

When i load the model blogmodel.php it causes a white screen, but if i comment out the load model, its working.

my controller blog.php

<?php
class Blog extends CI_Controller {

public function index()
{
    $this->load->model('blogmodel');

    $data['links'] = array('Pages','Modules','Users');

    $data['title'] = "SWAN";
    $data['heading'] = "SWAN";  
    $data['query'] = $this->db->get('admin');


    $this->load->view('blogview',$data);
}

}

?>

my model blogmodel.php

<?php
    class Blogmodel extends CI_Model {

    function__construct()
    {
        parent::__construct();
    }
}
?>

I followed the user guide and I don't know what I did wrong. I've switched on the display error in php.ini.developing on 11.10 ubuntu. Tested on chrome and it gives me a server error