The problem when extend the form_validation system library

[eluser]Sarwar CSE[/eluser]
Same Problem

path application/library/GSValidation.php

class :

Code:

class GSValidation extends CI_Form_validation{
function __construct() {
        parent::__construct ();
    }
    function GetMessage(){
        echo "Test SuccessFull";
    }
}

when i load the library by this $this->load->library('GSValidation') then the error shows

Code:

Fatal error: Class 'CI_Form_validation' not found in \application\libraries\GSValidation.php on line 2

Please Advice me