title: Xcode error: Could not launch app - unable to attach
body: <p>I updated Xcode to version 7.2. Every time I edit some code then run the application, Xcode will display:</p>
  <blockquote>
  <p>Could not launch &quot;APP_NAME&quot;<br />
  unable to attach</p>
  </blockquote>
  <p>However, when I run the app again, it will run successful.</p>
  <p>Indeed, I can run the application but I feel uncomfortable when I face this problem every time</p>
  <p><a href="https://i.stack.imgur.com/SuAba.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SuAba.png" alt="unable to attach" /></a></p>