title: state restoration in iOS
body: <p>I am storing my application screen, so that when the application gets opened it will show the screen that was stored. The application is navigation based. </p>
  
  <p>I have assigned the Restoration Ids to my two view controllers in main story board. The first controller is the root view controller of the navigation controller. I have also assigned Restoration Id to the navigation controller. 
  Now the problem is when I run the application I am getting the following warning:</p>
  
  <blockquote>
    <p>Unable to create restoration in progress marker file.</p>
  </blockquote>
  
  <p>Not sure what else need to be done.</p>