CI_Loader extend causing headers error

[eluser]orzilca[/eluser]
Update
Changed the code and got the header error again

Code:

class MY_Loader extends CI_Loader
    {

        function __construct() {
            parent::__construct();
    
            $CI =& get_instance();
            $CI->load = $this;
        }

        public function load_header()
        {
            echo 'header';
        }
        
        public function load_footer()
        {
            echo 'footer';
        }
        
    }

Error

Code:

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /mounted-storage/home75b/sub007/sc43190-SREL/gogetmilk.com/application/core/MY_Loader.php:1)

Filename: libraries/Session.php

Line Number: 672

I haven't changed anything in codeigniter's core
its a brand new version from yesterday, just created my_loader