title: Command PhaseScriptExecution failed with a nonzero exit code after adding firebase
body: <p>I've got this error after I installed firebase podfile:</p>
  
  <pre><code>Build/Products/Debug-iphonesimulator/Guess The Code 2.app/Frameworks/GoogleUtilities.framework'
  </code></pre>
  
  <p>I tried this: <a href="https://stackoverflow.com/questions/51174105/xcode-10-beta-3-command-phasescriptexecution-failed-with-a-nonzero-exit-code">Xcode 10 Beta 3: Command PhaseScriptExecution failed with a nonzero exit code</a> but nothing has changed. 
  I also tried to install GoogleUtilities pod separately but the error remained. 
  What can I do?</p>
  
  <p>Podfile</p>
  
  <pre><code>pod 'Google-Mobile-Ads-SDK'
  pod 'GoogleMobileAdsMediationUnity'
  pod 'GoogleMobileAdsMediationAppLovin'
  pod 'SAConfettiView'
  pod 'Firebase' 
  </code></pre>
  
  <p>Xcode 10 beta 6
  Swift 4.2</p>