Errors in codeigniter-restserver library

Looks like this library is actually incompatible with ci303:
I tested simlar code in ci22 project and it dose not have any erros.
I copied library files from old ci22 project into c33 project ( * @version 3.0.0-pre ) and under ci33 it has errors
I moved thes files under application/core :

PHP Code:

require_once("application/core/REST22/REST_Controller.php");
require_once("application/core/REST22/Format.php"); 


Files name are ucfirst.

I tried to debug code of REST_Controller, but it apeared too difficult for me...
But in what are they different ? I know only  ucfirst difference, no more...

looks problems starts that format lib is not loaded? Is it difference?  

in file REST_Controller.php there is line :

PHP Code:

       $this->load->library('format'); 


But this library is not loaded ?