install on windows 7 not working

I’m using Windows 7 / WP 3.6 / DesktopServer – In my AssetsMinify configuration in admin section I have:

Compass compiler’s path: c:\Ruby200x64\bin\compass

In my header.php page I added:

<?php

wp_enqueue_style( ‘screen’, get_template_directory_uri() . ‘/sass/screen.scss’ );

?>
<?php wp_head(); ?>

It adds screen.scss to my wordpress page – but it does not compile the “/sass/screen.scss” file.

There are no error messages – Please help

http://wordpress.org/plugins/assetsminify/