Problema ao carregar do arquivo a lista de itens

Ao abrir a tela de adicionar uma meal, ela não abre e dar um erro na linha que passa o os itens para o array de itens, do metodo viewDidLoad. Erro: Could not cast value of type 'eggplant_brownie.Item' (0x1000df258) to 'NSArray' (0x1a054d418). (lldb)

Codigo da classe abaixo

import UIKit

protocol AddMealDelegate {
    func add(meal:Meal)
}


class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, AddAnItemDelegate {


    @IBOutlet var nameField: UITextField!;
    @IBOutlet var happinessField: UITextField!;
    @IBOutlet var tableView:UITableView?
    var delegate:AddMealDelegate?

    var items = Array<Item>()

    var selecionados = Array<Item>()


    override func viewDidLoad() {

        let newItemButton = UIBarButtonItem(title: "New Item",
                                            style: UIBarButtonItemStyle.Plain,
                                            target: self,
                                            action: #selector(ViewController.showNewItem))
        navigationItem.rightBarButtonItem = newItemButton

        let dir = getUserDir()
        let archive = "\(dir)/eggplant-brownie-items"
        if let loaded = NSKeyedUnarchiver.unarchiveObjectWithFile(archive) {
            items = loaded as! Array
        }


    }

    func showNewItem(){
        let newItem = NewItemViewController(delegate: self)

        if let navigation = navigationController{
            navigation.pushViewController(newItem, animated: true)
        }else{
            Alert(controller:self).show()
        }
    }

    func getUserDir() -> String {
        let userDir = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)

        let dir = userDir[0] as String

        return dir
    }

    func add(item:Item){
        items.append(item)
        if let table = tableView{
             let dir = getUserDir()
            let archive = "\(dir)/eggplant-brownie-items"
            NSKeyedArchiver.archiveRootObject(item, toFile: archive)
            table.reloadData()
        }else{
            Alert(controller: self).show("Unexpected Error, but the item was added")

        }
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let row = indexPath.row
        let item = items[row]

        let cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: nil)
        cell.textLabel?.text = item.name

        return cell
    }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        if let cell = tableView.cellForRowAtIndexPath(indexPath){

            let item = items[indexPath.row]


            if cell.accessoryType == UITableViewCellAccessoryType.None {
                cell.accessoryType = UITableViewCellAccessoryType.Checkmark
                selecionados.append(item)

                print("Nome: \(item.name)")
            }else{
                cell.accessoryType = UITableViewCellAccessoryType.None
                if let position = selecionados.indexOf(item) {
                    print("Objeto encontrado \(selecionados[position].name)")
                    selecionados.removeAtIndex(position)
                }else{
                    Alert(controller: self).show()                }
            }
        }else{
            Alert(controller: self).show()
        }


    }


    func getMealFromForm() -> Meal?{
        if nameField == nil || happinessField == nil {

            return nil
        }

        let name = nameField.text!;
        let happiness = Int(happinessField.text!)

        if happiness == nil {
            return nil
        }


        let meal = Meal(name: name, happiness: happiness!)
        meal.items = selecionados

        return meal

    }


    @IBAction func add(){
        if let meal =  getMealFromForm(){
            if let meals = delegate{
                meals.add(meal)

                if let navigation = self.navigationController{
                    navigation.popViewControllerAnimated(true)
                }else{
                    Alert(controller: self).show("Unexpected erro, but the meal was added")
                }
                return
            }
        }
        Alert(controller: self).show()
    }


}