title: FirebaseApp.configure() has an error use of unresolved identifier 'FirebaseApp'
body: <p>So every time in my pod file I decide to add something like pod 'Firebase/Storage’ with pod 'Firebase/Core’, in my app delicate <code>FirebaseApp.configure()</code> has an error use of unresolved identifier 'FirebaseApp' my pod file is </p>
  
  <p><a href="https://docs.google.com/document/d/1U7s5StRuNrI_2WtpHSvHhwhA1TMCsQ255dnjDAEhhcE/edit?usp=sharing" rel="noreferrer">https://docs.google.com/document/d/1U7s5StRuNrI_2WtpHSvHhwhA1TMCsQ255dnjDAEhhcE/edit?usp=sharing</a></p>