title: angular-cli: ng serve command with config error
body: <pre><code>Cannot read property 'config' of null
  TypeError: Cannot read property 'config' of null
      at Class.run (C:\Users\me\AppData\Roaming\npm\node_module
      at checkExpressPort.then.then (C:\Users\goldneda\AppData\Roamin
      at process._tickCallback (internal/process/next_tick.js:103:7)
  </code></pre>
  
  <p>Did any one got the same error? What should I do? I'm working with angular-cli, but things just stop working for some reason.</p>