title: Firebase.h file not found with CocoaPods
body: <p>I am trying to add Firebase into my project. I just added below pods into my Xcode project.</p>
  
  <pre><code>  pod 'Firebase'
    pod 'Firebase/Core'
    pod 'Firebase/Messaging'
    pod 'Firebase/Database'
    pod 'Firebase/Auth'
  </code></pre>
  
  <p>After installing podfile, I try to import firebase into my project. But it gives me an error that <strong>Firebase.h is not found.</strong></p>
  
  <p><a href="https://i.stack.imgur.com/jpVOs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jpVOs.png" alt="na"></a></p>
  
  <p>Above issue will occur when I uncheck the <code>Run script only when installing</code> from <code>[CP] Check pods Manifest.lock</code>. After that I will installed pod using <code>pod install</code>. And then issue will occur.</p>
  
  <p>Error which I got after uncheck the checkbox:</p>
  
  <pre><code>error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.
  </code></pre>