can't get phantom js hello world to work

I am looking to learn more about phantomjs.

• installed sudo npm install -g phantomjs

• installed phantom into my package.json (npm install phantom --save)

• running phantom js

• making sure to require phantom in my app.js ** also tried to create a hello.js file

  console.log('hello world');
  phantom.exit();
  

However, my command line shows 'cannot find module events'. When I ran the same syntax in hello.js my command line shows 'cannot open hello.js'.

Am i missing something very simple?