Error on starting realie

wall:express $ git submodule update
Initialized empty Git repository in /Projects/realie/vendor/express/lib/support/class/.git/
fatal: The remote end hung up unexpectedly
Clone of 'git://github.com/visionmedia/class.js.git' into submodule path 'lib/support/class' failed



wall:realie wall$ node app.js 
node.js:275
        throw new Error("Cannot find module '" + request + "'");
              ^
Error: Cannot find module 'ext'
    at loadModule (node.js:275:15)
    at require (node.js:411:14)
    at Object.<anonymous> (vendor/express/lib/express.js:9:1)
    at Module._compile (node.js:461:23)
    at Module._loadScriptSync (node.js:468:10)
    at Module.loadSync (node.js:338:12)
    at loadModule (node.js:283:14)
    at require (node.js:411:14)
    at Object.<anonymous> (/Projects/realie/app.js:3:1)
    at Module._compile (node.js:461:23)