typing sass style.sass style.css getting "uninitialized constant sass"

[roguecartel]

Hi,

I went through the installation process -- I did a clean install of
ruby/rails and now did haml and compass.

However, in my RadRails console, I type:

sass style.sass style.css

I get:

uninitialized constant Sass

I don't know what to do.

sass -v

generates:
Haml/Sass 2.2.16 (Powerful Penny)

So something is set up right, but not processing. Thanks.