title: Xcode cannot run using the selected device
body: <p>I am receiving the following error when I try to run my Xcode iOS project:</p>
  
  <pre><code>Xcode cannot run using the selected device. Choose a destination with a supported architecture in order to run on this device.
  </code></pre>
  
  <p>I have had this error for a while now. I was able to get around it by using an actual device instead of a simulator, but now that doesn't work either. I haven't changed a single setting in the project since creating it, all that I have changed is the code itself. This has also happened before and the only way I fixed it was to create a new project and start from scratch and now it is happening again from that. I am so frustrated! I have no idea what to do. What info do I need to provide to help diagnose this? I am using the facebook sdk 3.1 if that means anything.</p>
  
  <p>Thanks</p>