title: Error after packaging the app with electron-packager
body: <p>I'm new to Electron, and I really love it so far, but I'm unable to package any of mine apps, at first I thought that it's maybe something related to my code, then I download "<a href="https://github.com/atom/electron-quick-start" rel="nofollow noreferrer">https://github.com/atom/electron-quick-start</a>" run npm install and then I run "electron-packager . FooBar --platform=darwin --arch=x64 --version=0.28.2" it build the app but when I try to open it I get </p>
  
  <p><a href="https://i.stack.imgur.com/z8k19.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/z8k19.png" alt="enter image description here"></a></p>
  
  <p>so I didn't touch any code from the example, just wanted to build it and I got an error, what am I doing wrong? Thanks!</p>