Loading session class triggers header error

[eluser]Unknown[/eluser]
Hi all,
I'm new to this forum and this is my first post, it is a really simple problem. Each time I attempt to load the session class in any of my controllers and then load a view, I get a "cannot modify header information error" in this view.
Example

Code:

<?php
class Example extends CI_Controller {
        public function Example()
        {
           parent::__construct();
           $this->load->library('session');
        }


    public function index()
    {
           $this->session->set_userdata('user','examplename');
           $user = $this->session->get_userdata('user');
           $this->load->view("example_view", array('name'=>$user));
    }

}
?>

Now if I were to run this script, I will get an error similar to
Message: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\...\example.php:6)
Filename: libraries/Session.php

Line Number: 686
The view loads, but I would really want to remove this message from it. If you have any idea about its cause please let me know

Thanks