I'm new to Xcode and swift.
I have started to work with TwitterKit, I have installed it on my project using cocoapods, I followed this tutorial: https://dev.twitter.com/twitterkit/ios/installation
The problem is, when I try to initialize TwitterKit in AppDelegate, I can't use the Twitter.sharedInstace, because Twitter does not exist. (I've imported the TwitterKit in the AppDelegate using import TwitterKit)
Here is my App Delegete class:
import UIKit
import TwitterKit
import Firebase
import FirebaseAuth
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        Twitter.sharedInstance().start(withConsumerKey:"********", consumerSecret:"*******") 
        //Here I get the error: Use of unresolved identifier 'Twitter'       
        return true
        }
What am I doing wrong?
 
    