Type 'Segue' has no member 'restaurantList'

I am trying to learn Xcode using a book called 'iOS 14 Programming for Beginners'. Although the book is supposed to show the correct code I have found that it still raises errors when I type in the code. They also have the code online, which I have downloaded and compared to my code, yet I still get errors. Here is the file that produces the errors:

//
//  ExploreViewController.swift
//  EatOut
//
//  Created by Tony Hudson on 15/07/2021

//
import UIKit

class ExploreViewController: UIViewController,
UICollectionViewDelegate {

    @IBOutlet weak var collectionView:
UICollectionView!
    let manager = ExploreDataManager()
    var selectedCity: LocationItem?
    var headerView: ExploreHeaderView!

    override func viewDidLoad() {
        super.viewDidLoad()
        initialize()
    }

    override func prepare(for segue:
UIStoryboardSegue, sender: Any?) {
        switch segue.identifier {
        case
Segue.locationList.rawValue:
showLocationList(segue: segue)
        case
Segue.restaurantList.rawValue:   //ERROR
HERE
showRestaurantListing(segue: segue)
        default:
            print("Segue not added")
        }
    }

    override func
shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool
{
        if identifier ==
Segue.restaurantList.rawValue { //AND HERE
            guard selectedCity!= nil else {
showAlert()
             
return false
            }
            return true
       }
        return true
    }
}

// MARK: Private Extension
private extension ExploreViewController {
    func initialize() {
        manager.fetch()
    }

    func showLocationList(segue:
UIStoryboardSegue) {
        guard let navController =
segue.destination as? UINavigationController, let viewController =
navController.topViewController as? LocationViewController else {
            return
        }
        guard let city = selectedCity
else {
           return
        }
        viewController.selectedCity = city
    }

    func showRestaurantListing(segue:
UIStoryboardSegue) {
        if let viewController =
segue.destination as? RestaurantListViewController, let city = selectedCity,
let index = CollectionView.indexPathsForSelectedItems?.first {
viewController.selectedType = manager.explore(at: index).name
viewController.selectedCity = city
        }
    }
    func showAlert() {
        let alertController = UIAlertController(title:
"Location Needed", message: "Please select a location.",
preferredStyle: .alert)
        let okAction =
UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(okAction)
        present(alertController,
animated: true, completion: nil)
    }



    



    @IBAction func unwindLocationCancel(segue:
UIStoryboardSegue){
    }

    @IBAction func
unwindLocationDone(segue:UIStoryboardSegue) {
        if let viewController =
segue.source as? LocationViewController {
            selectedCity =
viewController.selectedCity
            if let location =
selectedCity {
headerView.lblLocation.text = location.full
            }
        }
    }
}

// MARK: UICollectionViewDataSource
extension ExploreViewController: UICollectionViewDataSource
{

    func collectionView(_ collectionView:
UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath:
IndexPath) -> UICollectionReusableView {
        let header =
collectionView.dequeueReusableSupplementaryView(ofKind: kind,
withReuseIdentifier: "header", for: indexPath)
        headerView = header as?
ExploreHeaderView
        return headerView
    }

    func collectionView(_ collectionView:
UICollectionView, numberOfItemsInSection section: Int) -> Int {
        manager.numberOfItems()
    }

    func collectionView(_ collectionView:
UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
        let cell =
collectionView.dequeueReusableCell(withReuseIdentifier:
"exploreCell", for: indexPath) as! ExploreCell
        let item = manager.explore(at:
indexPath)
        cell.lblName.text = item.name
        cell.imgExplore.image = UIImage(named:
item.image)
        return cell
    }
//

Can anyone see why this is producing this error?```