Error with format library (from REST Controller) in combination with MX

[eluser]mvdg27[/eluser]
I'm using the latest version of REST controller by Phil Sturgeon and I keep getting an error, with the format library, in combination with Modular Extensions. Can't really figure out where the error lies

It's the following error:

Code:

Message: Undefined property: CI::$format
Filename: MX/Loader.php
Line Number: 166

Any ideas? Thanks!

[eluser]mvdg27[/eluser]
Nevermind, figured it out already .. REST_Controller should have extended MX_Controller instead of CI_Controller.