Failed to load COMPASS resource: the server responded with a status of 404 (Not Found)

Failed to load COMPASS resource: the server responded with a status of 404
(Not Found)

I created a theme on liferay 6.2 using the same css, jsp, js, images of
classic theme (which is located in ROOT\html\themes\classic).
My copied theme works fine and all the standard css works except the
compass and sass doesn't work.
COMPASS Version 0.12.2
SASS Version 3.2.1
My custom.css:
@import "compass";
@import "mixins";
@import url(custom_common.css);
$dockbarGradientEnd: #1273C7;
$dockbarGradientStart: #118ADE;
$dockbarOpenGradientEnd: #0993DD;
$dockbarOpenGradientStart: #0EA6F9;
/* ---------- Base styles ---------- */
.aui {
.separator {
border-color: #BFBFBF transparent #FFF;
border-style: solid;
border-width: 1px 0;
}
#wrapper {
background: none;
margin: 0 auto;
padding: 2em 5em 0;
position: relative;
@include respond-to(phone) {
padding-left: 0.5em;
padding-right: 0.5em;
}
@include respond-to(tablet) {
padding-left: 1em;
padding-right: 1em;
}
}
/* etc....... */
In the Firebug i get this error:
Failed to load resource: the server responded with a status of 404 (Not
Found) http://localhost:8080/test-theme/css/compass
I don't know why the compass and sass works fine in classic theme but
doesn't work in my theme that is identical to the classic theme. Why?!
Any help will be greatly appreciated! Thank you!