The .css output reads:
Syntax error: File to import not found or unreadable: compass/support.
on line 93 of sass/_base.scss
Line 93 of sass/_base.scss reads:
@import "compass/support"; // Add Compass' IE and vendor prefix support variables.
But the zen files don't include any compass/support files
I have installed compass (and Sass) with ruby, and created a compass project in E:/xampp/htdocs/drupal/sites/all/themes/data.