FirebaseUIでcannot find FUITwitterAuth() in scopeとなってしまう

公式サイトを参考にFirebaseUIを使用して，ログイン認証を実装したいのですが，cannot find FUITwitterAuth() in scopeとなり，エラーになってしまいます．必要なライブラリはpod installで実行していますが，原因がわからないのでご教示願います．

Podfile
1# Uncomment the next line to define a global platform for your project
2# platform :ios, '9.0'
3
4target 'xxx' do
5  # Comment the next line if you don't want to use dynamic frameworks
6  use_frameworks!
7
8  # Pods for LoveJudgement
9
10
11  pod 'Firebase'
12  pod 'Firebase/Auth'
13  pod 'Firebase/Core'
14  pod 'Firebase/Storage'
15  pod 'Firebase/Firestore'
16  pod 'SDWebImage', '~> 5.0'
17  pod "ViewAnimator"
18  pod 'ActiveLabel'
19  pod 'Charts'
20  pod 'NendSDK_iOS'
21  pod 'NVActivityIndicatorView'
22  pod 'FirebaseUI'
23
24end
25

AppDelegate.swift
1@UIApplicationMain
2class AppDelegate: UIResponder, UIApplicationDelegate {
3
4
5
6    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
7        // Override point for customization after application launch.
8        
9        FirebaseApp.configure()
10        return true
11    }
12    
13
14//Google ログインまたは Facebook ログインを有効にしている場合は、Google ログインと Facebook ログインのフローの結果を処理するハンドラを実装します。
15    func application(_ app: UIApplication, open url: URL,
16                     options: [UIApplication.OpenURLOptionsKey : Any]) -> Bool {
17        let sourceApplication = options[UIApplication.OpenURLOptionsKey.sourceApplication] as! String?
18      if FUIAuth.defaultAuthUI()?.handleOpen(url, sourceApplication: sourceApplication) ?? false {
19        return true
20      }
21      // other URL handling goes here.
22      return false
23    }
24    
25
26    // MARK: UISceneSession Lifecycle
27
28    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
29        // Called when a new scene session is being created.
30        // Use this method to select a configuration to create the new scene with.
31        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
32    }
33
34    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
35        // Called when the user discards a scene session.
36        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
37        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
38    }
39
40
41}

ViewController.swift
1
2import UIKit
3import Firebase
4import FirebaseAuth
5import FirebaseUI
6
7class ViewController: UIViewController, FUIAuthDelegate {
8    
9    
10    let authUI = FUIAuth.defaultAuthUI()
11    let providers: [FUIAuthProvider] = [
12      FUIGoogleAuth(),
13      FUIFacebookAuth(),
14      FUITwitterAuth(),
15      FUIPhoneAuth(authUI:FUIAuth.defaultAuthUI()),
16    ]
17    
18    override func viewDidLoad() {
19        super.viewDidLoad()
20        
21        authUI?.delegate = self
22        self.authUI?.providers = providers
23        let authViewController = (authUI?.authViewController())!
24        self.present(authViewController, animated: true, completion: nil)
25        
26    }
27    func authUI(_ authUI: FUIAuth, didSignInWith user: FIRUser?, error: Error?) {
28  // handle user and error as necessary
29    }
30}