Я пытаюсь настроить Firebase в своем приложении и пытаюсь добавить несколько условий, если чья-либо информация для входа неверна. я добавилuser, error in, По какой-то причине я могу заставить заявления if работать правильно. Любая строка со следующимif error!=nil{ приходит с ошибкойexpected "{" after if declaration

//
//  RegistrationViewController.swift
//  StudyBuddy
//
//  Created by Basel Anani on 7/25/16.
//  Copyright © 2016 StudyBuddy. All rights reserved.
//

import UIKit
import Firebase

class RegistrationViewController: UIViewController {

    @IBOutlet weak var userEmailTextField: UITextField!
    @IBOutlet weak var userPasswordTextField: UITextField!
    @IBOutlet weak var userConfirmPasswordTextField: UITextField!

    override func viewDidLoad() {
         super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func registerButtonTapped(sender: AnyObject) {

        let userEmail = userEmailTextField.text;
        let userPassword = userPasswordTextField.text;
        let userConfirmPassword = userConfirmPasswordTextField.text;

        //Check for Empty Fields
        FIRAuth.auth()?.createUserWithEmail(userEmailTextField.text!, password: userPasswordTextField.text!, completion: {

            user, error in

            if error !=nil{

            }
            else {
                print("User Created")
                self.login()
            }
        })

        func login(){
                FIRAuth.auth()?.signInWithEmail(userEmailTextField.text!, password: userPasswordTextField.text!, completion: {
                user, error in

                if error !=nil {

                    print("Incorrect")
                }
                else{

                    print("Login Successful")
                }




        })



        //Save Stored Data

    func displayMyAlertMessage(userMessage:String) {

        var myAlert = UIAlertController(title: "Alert", message:     "userMessage", preferredStyle: UIAlertControllerStyle.Alert);

        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);

        myAlert.addAction(okAction);

        self.presentViewController(myAlert, animated: true, completion: nil);

        if (userEmail!.isEmpty) {

            displayMyAlertMessage("All fields are required");


            return;
        }

        if (userPassword!.isEmpty) {

            displayMyAlertMessage("All fields are required");

            return;
        }

        if (userConfirmPassword!.isEmpty) {

             displayMyAlertMessage("All fields are required");

            return;
        }

        if userPassword != userConfirmPassword {
            displayMyAlertMessage("Passwords do not match");
        }

    }



        }}}