Xcode Gives False '{' missing in class error

Xcode says a curly bracket is missing at the end of my class, but it's not here's my code.
Xcode says that { is missing in my class, but it's not, which causes other errors at the @objc private functions saying attribute private can only be used in a non-local scope, and also gives another error at my extensions saying declaration is only valid at file scope, here's my code.

import UIKit
import Foundation
import Firebase
import FirebaseDatabase
import FirebaseAuth
import GoogleSignIn
import FBSDKLoginKit
import SCLAlertView
import UserNotifications
import FirebaseStorage


class SignupViewController: UIViewController {

Code Block 
@IBOutlet weak var usernameTextfield: UITextField!
@IBOutlet weak var emailTextField: UITextField!
@IBOutlet weak var passwordTextField: UITextField!
@IBOutlet weak var reenterPasswordTextField: UITextField!
@IBOutlet weak var signupButton: UIButton!
@IBOutlet weak var errorlabel: UILabel!
@IBOutlet weak var passwordEye: UIImageView!
@IBOutlet weak var cameraButton: UIImageView!
@IBOutlet weak var googleBtn: UIButton!
@IBOutlet weak var fbBtn: UIButton!
var database: DatabaseReference!
private let storage = Storage.storage().reference()
override func viewDidLoad() {
		super.viewDidLoad()
		
		database = Database.database().reference()
		
}
func aftersuccess(){
		passwordTextField.isSecureTextEntry = true
		reenterPasswordTextField.isSecureTextEntry = true
		
		GIDSignIn.sharedInstance().presentingViewController = self
		
		passwordEye.isUserInteractionEnabled = true
		passwordEye.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(eyeSelected)))
		
		setUpElements()
		cameraButton.isUserInteractionEnabled = true
		cameraButton.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cameraButtonPressed)))
		let spacerView = UIView(frame:CGRect(x:0, y:0, width:30, height:10))
		passwordTextField.leftViewMode = UITextField.ViewMode.always
		passwordTextField.leftView = spacerView
		let spacerView2 = UIView(frame:CGRect(x:0, y:0, width:30, height:10))
		emailTextField.leftViewMode = UITextField.ViewMode.always
		emailTextField.leftView = spacerView2
		let spacerView3 = UIView(frame:CGRect(x:0, y:0, width:30, height:10))
		reenterPasswordTextField.leftViewMode = UITextField.ViewMode.always
		reenterPasswordTextField.leftView = spacerView3
		let spacerView4 = UIView(frame:CGRect(x:0, y:0, width:30, height:10))
		usernameTextfield.leftViewMode = UITextField.ViewMode.always
		usernameTextfield.leftView = spacerView4
		cameraButton.layer.masksToBounds = true
		cameraButton.layer.cornerRadius = 80
		cameraButton.contentMode = .scaleToFill
		googleBtn.layer.cornerRadius = googleBtn.frame.width/2
		googleBtn.layer.masksToBounds = true
		fbBtn.layer.cornerRadius =
				fbBtn.frame.width / 2
		fbBtn.layer.masksToBounds = true
		guard	let urlString = UserDefaults.standard.value(forKey: "url") as? String,
					 let url = URL(string: urlString) else {
				return
		}
		
		let task = URLSession.shared.dataTask(with: url, completionHandler: { data, _, error in
				guard let data = data, error == nil else{
						return
				}
				
				DispatchQueue.main.async {
						let image = UIImage(data: data)
						self.cameraButton.image = image
				}
		})
		
		task.resume()
}
override func viewWillDisappear(_ animated: Bool) {
		aftersuccess()
}
override func viewWillAppear(_ animated: Bool) {
		aftersuccess()
}
func setUpElements() {
		
		//Hides error label
		errorlabel.alpha = 0
}
func validateFields() -> String? {
		if usernameTextfield.text?.trimmingCharacters(in: .whitespacesAndNewlines) == ""	|| emailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" {
				SCLAlertView().showError("Try Again",subTitle:"😱Please fill in all of the fields😱")
		}
		
		let cleanedPassword = passwordTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
		
		if Utilities.isPasswordValid(cleanedPassword) == false {
				
				SCLAlertView().showError("Try Again",subTitle:"😱Please make sure your password is at least 8 characters, contains a special character, and a number.😱")
		}
		return nil
}
@IBAction func didChangeSegement(_ sender:UISegmentedControl){
		if sender.selectedSegmentIndex == 1{
				let vc = storyboard?.instantiateViewController(identifier: "loginVC") as! LoginViewController
				vc.modalPresentationStyle = .fullScreen
				present(vc, animated: true)
		}
}
@IBAction func signUpTapped(_ sender: UIButton) {
		
		let error = validateFields()
		
		if error != nil {
				
				sender.shake()
				SCLAlertView().showError("Uh Oh",subTitle:"Something went wrong")
		}else if reenterPasswordTextField.text! != passwordTextField.text!{
				sender.shake()
				SCLAlertView().showError("Try Again",subTitle:"😱Your passwords do not match.😱")
		}else {
				
				let username = usernameTextfield.text!.trimmingCharacters(in: .whitespacesAndNewlines)
				let email = emailTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
				let password = passwordTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
				

// DatabaseManager.shared.userExists(with: email, completion: { exists in
// if !exists{
//
// }
// })
}
}

Code Block 
func transitionToHome() {
		
		let homeViewController = storyboard?.instantiateViewController(identifier: Constants.Storyboard.homeViewController) as? HomeViewController
		
		view.window?.rootViewController = homeViewController
		view.window?.makeKeyAndVisible()
		
}
@objc private func eyeSelected(){
		passwordTextField.isSecureTextEntry.toggle()
		if passwordTextField.isSecureTextEntry ==	true{
				passwordEye.image = UIImage(systemName: "eye")
		}else{
				passwordEye.image = UIImage(systemName: "eye.fill")
		}
}
@IBAction func googleBtnPressed(_ sender: Any) {
		if GIDSignIn.sharedInstance()?.currentUser != nil{
				
		}else{
				GIDSignIn.sharedInstance()?.signIn()
				if let user = GIDSignIn.sharedInstance()?.currentUser{
						DatabaseManager.shared.userExists(with: user.profile.email, completion: { exists in
								guard !exists else{
										SCLAlertView().showError("Oof",subTitle:"😱Someone with this account already exists😱")
										return
								}
								DatabaseManager.shared.insertUser(with: UserModel(username: user.profile.name, email: user.profile.email, password: "null (Google Sign In)", profilePictureURL: "nil"))
								GIDSignIn.sharedInstance()?.presentingViewController = self
								let homeViewController = self.storyboard?.instantiateViewController(identifier: "homeVC") as! HomeViewController
								
								homeViewController.modalPresentationStyle = .fullScreen
								self.present(homeViewController, animated: true)
								
						})
				}
		}
}
@IBAction func fbBtnPressed(_ sender: Any) {
		
		let fbLoginManager = LoginManager()
		fbLoginManager.logIn(permissions: ["public_profile", "email"], from: self) { (result, error) in
				if error != nil {
						SCLAlertView().showError("Oof",subTitle:"😱Error signing you in.😱")
						return
				}
				
				guard let accessToken = AccessToken.current else {
						SCLAlertView().showError("Oof",subTitle:"😱Try again without Facebook😱")
						return
				}
				
				let credential = FacebookAuthProvider.credential(withAccessToken: accessToken.tokenString)
				
				Auth.auth().signIn(with: credential, completion: { (user, error) in
						if error != nil {
								SCLAlertView().showError("Oof",subTitle:"😱Error signing you in.😱")
								return
						}
						else {
								
								
								let user = Auth.auth().currentUser!
								
								DatabaseManager.shared.userExists(with: user.email!, completion: { exists in
										guard !exists else{
												SCLAlertView().showError("Oof",subTitle:"😱Someone with this account already exists😱")
												return
										}
										
										
										DatabaseManager.shared.insertUser(with: UserModel(username:user.displayName!, email: user.email!, password: "null (Facebook Sign In)", profilePictureURL: "null"))
										
										let homeViewController = self.storyboard?.instantiateViewController(identifier: "homeVC") as! HomeViewController
										
										homeViewController.modalPresentationStyle = .fullScreen
										self.present(homeViewController, animated: true)
										
								})
						}
				})
				
		}
}
@objc private func cameraButtonPressed(){
		presentPhotoActionSheet()
}

}

extension SignupViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

Code Block 
func presentPhotoActionSheet(){
		let actionSheet = UIAlertController(title: "Profile Picture", message: "Which way would you like to select a profile picture", preferredStyle: .actionSheet)
		actionSheet.addAction(UIAlertAction(title: "Cancel", style: .destructive, handler:nil))
		actionSheet.addAction(UIAlertAction(title: "Take Photo", style: .default, handler: { [ weak self ] _ in
				
				self?.presentCamera()
				
		}))
		actionSheet.addAction(UIAlertAction(title: "Choose Photo", style: .default, handler: { [ weak self ]	_ in
				
				
				self?.presentPhotoPicker()
		}))
		
		present(actionSheet, animated: true)
		
}
func presentCamera(){
		
		let vc = UIImagePickerController()
		vc.sourceType = .camera
		vc.delegate = self
		vc.allowsEditing = true
		present(vc, animated: true)
		
}
func presentPhotoPicker(){
		
		let vc = UIImagePickerController()
		vc.sourceType = .photoLibrary
		vc.delegate = self
		vc.allowsEditing = true
		present(vc, animated: true)
		
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
		picker.dismiss(animated: true, completion: nil)
		print(info)
		
		guard let selectedImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage else{
				return
		}
		
		guard let imageData = selectedImage.pngData() else{
				return
		}
		
		storage.child("images/" +	"filename" +	".png").putData(imageData, metadata: nil, completion: { _, error in
				guard error == nil else{
						SCLAlertView().showError("Image can't be uploaded",subTitle:"😱Please choose another image😱")
						return
				}
				
				self.storage.child("images/file.png").downloadURL(completion: { url, error in
						guard let url = url, error == nil else{
								return
						}
						
						let urlString = url.absoluteString
						UserDefaults.standard.set(urlString, forKey: "url")
				})
		})
		self.cameraButton.image = selectedImage
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
		picker.dismiss(animated: true, completion: nil)
}

}