Could not attach to pid : “####” unable to attach
<p>I just updated to Xcode 7.3.1 and my project crashes with the same error after the launch screen displays on the iOS simulator. </p>

<p>The error is:</p>

<blockquote>
  <p>"Could not attach to pid : “1712” unable to attach"</p>
</blockquote>

<p>Then I tried running another project and I got:</p>

<blockquote>
  <p>"Could not attach to pid : “2025” unable to attach"</p>
</blockquote>

<p>Any solutions? </p>