title: iPhone App Converted to Universal, works fine on device, but validation fails with message "Nib file not found"
body: <p>I already searched stackoverflow.com, followed the instructions from Answered posts, but nothing works for me. So, this is not a duplicate post.</p>
  
  <p>I developed my app for iPhone, uploaded and it's already in the app store. Now I made it as universal App and made some slight changes for iPad view.</p>
  
  <pre><code>bool IsIPad=[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;
  
  if (IsIpad)
  {
      //do something specific for iPad view
  }
  </code></pre>
  
  <p>It's all working fine in the simulator/device. But fails when I attempt to upload to appstore. I tried creating Main-iPad.storyboard, the app shows black screen.
  When I remove "Main nib file base name (iPad)", the validation succeeds, but I can't upload it because it only shows blank screen.</p>
  
  <p><img src="https://i.stack.imgur.com/mgkFf.jpg" alt="enter image description here"></p>