Can't find css.js when using r.js

I am compiling my require.js based JavaScript together with r.js. We use the css plugin. Here is my build.js that I am running:

var requirejs = require('requirejs');
var sys = require("sys");
var prop = require("./node/config.js");
var extend = require('node.extend');

var baseNoC=prop.base.replace("C:/","");

window = {
    top: {
        M4_CONFIG: {
            path: prop.base + "/uif/trunk"
        }
    }
};


var amdConfig = require(prop.base + "/uif/trunk/scripts/bootstrap/amd-config");


var config = {
    baseUrl: "C:",
    name: "/"+baseNoC+"/uif/trunk/scripts/bootstrap/home-main.js",
    out: "main-built.js",
    optimize: "none",
    map: {
        '*': {            
            'css': baseNoC + "/vendor/trunk/require-plugins/require-css/0.0.3/css"
        }
    }
};

config = extend(config, amdConfig);
config.paths["all-files"]= window.top.M4_CONFIG.path + "/all-files";
//I tried it with this line in and out.
//config.paths["css"]="Projects/mercury/vendor/trunk/require-plugins/require-css/0.0.3/css";



requirejs.optimize(config, function(buildResponse) {
    //buildResponse is just a text output of the modules
    //included. Load the built file for the contents.
    //Use config.out to get the optimized file contents.

    var contents = fs.readFileSync(config.out, 'utf8');
}, function(err) {
    //optimization err callback
    sys.puts("error! " + err);
});

When I run my page with my generated JavaScript, I get "NetworkError: 404 Not Found - [domain]/css.js"

The location of the file is in the location specified on my config.map. Anyway, I don't understand why it isn't in my compiled JavaScript. What should I do?

P.S. We're using Sass and I wouldn't mind just packaging up one big css with Sass and telling it to ignore the !css in the code. (However, those are in there for historical reasons.)