$ node index.js

module.js:340

    throw err;

    ^

Error: Cannot find module './student.js'

    at Function.Module._resolveFilename (module.js:338:15)

    at Function.Module._load (module.js:289:25)

    at Module.require (module.js:366:17)

    at require (module.js:385:17)

    at Object.<anonymous> (D:\Program Files\nodejs\node_script\school\classgroup.js:3:

15)

    at Module._compile (module.js:435:26)

    at Object.Module._extensions..js (module.js:442:10)

    at Module.load (module.js:356:32)

    at Function.Module._load (module.js:313:12)

    at Module.require (module.js:366:17)