title: Angular 2 Cannot read property 'config' of null
body: <p>I have a issue with Angular 2. When i want to start server it get this:</p>
  
  <pre><code>$ ng serve
  Cannot read property 'config' of null
  TypeError: Cannot read property 'config' of null
  at Class.run (C:\Users\Damien\Desktop\application\node_modules\@angul ar\cli\tasks\serve.js:22:63)
  at check_port_1.checkPort.then.port (C:\Users\Damien\Desktop\application\node_modules\@angular\cli\commands\serve.js:103:26)
  at process._tickCallback (internal/process/next_tick.js:103:7)
  </code></pre>
  
  <p>I reinstalled CLI and nothing else is working. I could be something with json file?</p>