express Error: Cannot find module '../..'

I'm a beginer with node.js. I installed node on Ubuntu 12.04 and it works fine for simple simple apps. I also installed express using:

npm install -g express

I believe the installation worked fine since I get no errors but right now I want to run one of their apps from the examples (the mvc one) and I get the following error:

module.js:340
    throw err;
          ^
Error: Cannot find module '../..'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)
    at Object.<anonymous> (/home/andreii/Desktop/node/mvc/index.js:2:15)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)

Any ideas about how can I solve this problem? Thanks a lot guys!