title: Xcode 7.0.1 (7A1001) debugger "Unable to read data"
body: <p>I am learning the Swift programming language using Xcode 7.0.1. Now I have an error in my application which I try to debug, but the debugger is useless to me, because it cannot show the values of variables.</p>
  
  <p>See the picture below:</p>
  
  <p><a href="https://i.stack.imgur.com/rAMyL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rAMyL.png" alt="&quot;Unable to read data&quot;"></a></p>
  
  <p>I am 100% sure the button has a label. </p>
  
  <p>I did not find the solution so far.</p>