Node.js Sylus不在Azure上编译，在本地工作

我有一个nodejs应用程序，可以在windows和mac客户端本地正常工作，但是当我部署到azure时，它并不是从stylus创建css文件。下面是应用程序配置文件的相关部分。下面是package.json文件的依赖项部分

我做错了什么

app.configure(function() {
app.use(express.favicon(__dirname + '/site/img/favicon.ico'))
    app.set('port', 3109);
    app.locals.pretty = true;
  app.set('view engine', 'jade');
  app.set('views', __dirname + '/views');
    app.use(assets({
        src: __dirname + '/site'
    }));
    app.use(express.bodyParser());
    app.use(express.cookieParser());
    app.use(express.methodOverride());
    app.use(app.router);
    app.use(express.static(path.join(application_root, 'site')));
    app.use(stylus.middleware({ src: __dirname + '/site/css', compile: compile}));

    app.use(allowCrossDomain);
});

"dependencies": {
  "express": "~3.1.0",
  "path": "~0.4.9",
  "stylus": "0.31.0",
  "jade": "0.27.7",
  "connect-assets": "git://github.com/asrail/connect-assets#de0d2acc935",
  "moment": "1.7.2",
  "emailjs": "0.3.3",
  "mongoose": "~3.5.7",
  "mongodb": "1.2.x",
  "markdown": "~0.4.0",
  "formidable": "latest",
  "knox": "latest",
  "node-ini": "latest",
  "node-uuid": "latest"
},