shapado

`rescue in load_missing_constant': uninitialized constant Sass::Script (NameError)

Hi, I am trying to run Shapado (A rails based Stackoverflow clone). While running the script I get the following error - `rescue in load_missing_constant': uninitialized constant Sass::Script (NameError) I have haml installed - Haml/Sass 3.1.79 (Bleeding Edge) I do not understand how to get around this error. Can you give some pointer...