title: Why I get an "11db" error in XCode8 (Swift 3) when in Swift 2 there was none?
body: <p>I initially began to learn swift in August (2016) and since the swift 3 update my initial learning project no longer works.</p>
  
  <p>I am running XCode 8.2.1 on MacBook Pro with the Swift 3 programming language. </p>
  
  <p>The program has a button in the <code>Main.storyboard</code> which when clicked calls a method in the <code>ViewController</code> program.</p>
  
  <p>Here's the code:</p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController {
  
      @IBAction func pressButton(sender: UIButton) {
          print(sender)
      }
  
  }
  </code></pre>
  
  <p>Now, I receive the following message in the console "<code>11db</code>" </p>