iOS - Firebase error: Use of unresolved identifier FIRApp running supplied code
<p>When trying to configure XCode to work with Firebase 3, using the code in the setup docs gives me an error:</p>

<p><a href="https://firebase.google.com/docs/ios/setup#add_the_sdk">https://firebase.google.com/docs/ios/setup#add_the_sdk</a></p>

<pre><code>import UIKit
import Contacts
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    //contacts
    var contactStore = CNContactStore()


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {
        FIRApp.configure() &lt;-- Use of unresolved identifier 'FIRApp'
        // Override point for customization after application launch.
        return true
    }
</code></pre>