相关疑难解决方法(0)

我有问题。请帮忙。每当我尝试运行此代码时，它都会出现错误并显示在范围内找不到“FirebaseApp”。请帮忙！！！

import UIKit
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?

  func application(_ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions:
      [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    return true
  }