title: Facebook iOS SDK DemoApp shows "Sorry, an error has occurred" even after App ID configuration
body: <p>I downloaded the Facebook iOS SDK from <a href="https://github.com/facebook/facebook-ios-sdk/" rel="nofollow">https://github.com/facebook/facebook-ios-sdk/</a>.
  I opened the DemoApp, and I've set my app id in the code and in the application's plist for the url callback.
  When I run it on both simulator and device, as soon I hit the Login button, it opens up a Safari window displaying "Sorry, an error has occurred." on the Facebook page. My system clock is accurate (this was someone else's issue).</p>
  
  <p>Am I missing something?</p>
  
  <p>Thanks!</p>