title: Playground Xcode swift: WKWebView_scripting[..] Failed to obtain sandbox extension for path
body: <p>I created a new playground to learn using <code>WKWebView</code>. I started with the following code:</p>
  
  <pre><code>//: Playground - noun: a place where people can play
  
  import UIKit
  import WebKit
  
  let frame = CGRect(x: 0, y: 0, width: 800, height:600)
  let web = WKWebView(frame: frame)
  </code></pre>
  
  <p>then I get the following apparent error output messages written to the console:</p>
  
  <pre><code>2016-05-08 09:31:50.261 WKWebView_scripting[1219:82092] Failed to obtain sandbox extension for path=/var/folders/3w/jr5wk3ls4rb2l6fvks5mthkm0000gn/T/com.apple.dt.Xcode.pg/containers/com.apple.dt.playground.stub.iOS_Simulator.WKWebView-scripting-63C77091-F9CA-4CBE-AD9B-376D4857F44B/Library/Caches    /com.apple.dt.playground.stub.iOS_Simulator.WKWebView-scripting-63C77091-F9CA-4CBE-AD9B-376D4857F44B. Errno:1
  2016-05-08 09:31:50.263 WKWebView_scripting[1219:82092] Failed to obtain sandbox extension for path=/var/folders/3w/jr5wk3ls4rb2l6fvks5mthkm0000gn/T/com.apple.dt.Xcode.pg/containers/com.apple.dt.playground.stub.iOS_Simulator.WKWebView-scripting-63C77091-F9CA-4CBE-AD9B-376D4857F44B/Library/Caches/com.apple.dt.playground.stub.iOS_Simulator.WKWebView-scripting-63C77091-F9CA-4CBE-AD9B-376D4857F44B. Errno:1
  </code></pre>
  
  <p>What am I doing wrong here?</p>