FBSDKPaymentObserverでのエラー

Question

前提・実現したいこと

swiftでFirebaseを使ってtwitterのログイン機能を作ろうとしてるのですが、
FBSDKPaymentObserver.mファイルでエラーが出てしまいます。
ネットで調べても解決策が見つからず、
ご教授頂ければと思います。

以下のサイトを参考に作成しています。
リンク内容

発生している問題・エラーメッセージ

Property 'paymentDiscount' not found on object of type 'SKPayment *'

Property 'discounts' not found on object of type 'SKProduct *'

Property 'identifier' not found on object of type 'SKProductDiscount *'

該当のソースコード

ViewController.swift

import UIKit
import Firebase
import FirebaseUI

class ViewController: UIViewController,FUIAuthDelegate {
    
    @IBOutlet weak var AuthButton: UIButton!
    
    var authUI: FUIAuth { get { return FUIAuth.defaultAuthUI()!}}
    // 認証に使用するプロバイダの選択
    let providers: [FUIAuthProvider] = [
        FUITwitterAuth(),
        ]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // authUIのデリゲート
        self.authUI.delegate = self
        self.authUI.providers = providers
        AuthButton.addTarget(self,action: #selector(self.AuthButtonTapped(sender:)),for: .touchUpInside)
    }
    
    @objc func AuthButtonTapped(sender : AnyObject) {
        // FirebaseUIのViewの取得
        let authViewController = self.authUI.authViewController()
        // FirebaseUIのViewの表示
        self.present(authViewController, animated: true, completion: nil)
    }
    
    //　認証画面から離れたときに呼ばれる（キャンセルボタン押下含む）
    public func authUI(_ authUI: FUIAuth, didSignInWith user: User?, error: Error?){
        // 認証に成功した場合
        if error == nil {
            self.performSegue(withIdentifier: "toTopView", sender: self)
        }
        // エラー時の処理をここに書く
    }
}

↓AppDelegate.swift

import UIKit
import Firebase
import FirebaseUI
import TwitterKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
    
    override init() {
        super.init()
        // Firebase関連の機能を使う前に必要
        FirebaseApp.configure()
    }
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        //Twitter認証用のイニシャライズ
        TWTRTwitter.sharedInstance().start(withConsumerKey:"XXXXX",consumerSecret:"XXXXX")
        return true
    }
    
//    func application(_ application: UIApplication,
//                     didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?)
//        -> Bool {
//            FirebaseApp.configure()
//            return true
//    }
    
    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }
    
    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }
    
    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }
    
    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }
    
    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }
    
    
}

Podfileは以下のように書いています。

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'SwiftTest01' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  # Pods for SwiftTest01
  pod 'Firebase/Database'
  #pod 'MessageKit', '>= 1.0.0'
  #pod 'MessageKit'
  pod 'JSQMessagesViewController'
  #pod 'MessageInputBar'
  pod 'FirebaseUI'
  pod 'Firebase/Core'
end

試したこと

クリーンビルド等しましたが、解決せず

補足情報（FW/ツールのバージョンなど）

swift 4.0
xcode 9.0
--追記---
色々調べてみると、FBSDKPaymentObserverはFacebookでのログイン認証のためのファイルのようなのですが、
Facebookでのログインはさせないので、バグがなくなるならば外してしまいたのですが、、、、
そもそもどこから入ってきたファイルなのか分からず、、、、

Answer 1

pod 'FirebaseUI/Auth'
pod 'FirebaseUI/Twitter
↑で必要なプロバイダのみインストールしたら直りました