title: The identity used to sign the executable is no longer valid <= help me
body: <pre><code>**The identity used to sign the executable is no longer valid.** 
  Please verify that your device’s clock is properly set, and that your signing certificate is not expired.
  </code></pre>
  
  <p>I've met this error when build my app on iphone by Xcode device for 2 days. It had worked properly before. But only when build on that iphone, the other ios devices is normal, hic. can you help me :(</p>