Fatal error: Call to undefined function get_instance()

[eluser]kelye[/eluser]
hello
i have the following problem...

Code:

MY_Input.php

class MY_Input extends CI_Input {
    var $CI;
    
    function My_Input()
    {
        parent::CI_Input();
        $this->CI =& get_instance();
    }
}

and i get a "Fatal error: Call to undefined function get_instance() ..."