I keep getting Fatal Error with invalidSelection! What is wrong here?

I see at least one error; here is the correct code; see if you can spot it

class InventoryUnarchiver {

    static func vendingInventory(fromDictionary dictionary: [String: AnyObject]) throws -> [VendingSelection: VendingItem] {

        var inventory: [VendingSelection:VendingItem] = [:]

        for (key, value) in dictionary{
            if let itemDictionary = value as? [String: Any], let price = itemDictionary["price"] as? Double, let quantity = itemDictionary["quantity"] as? Int{
                let item = Item(price : price, quantity : quantity)

                guard let selection = VendingSelection(rawValue: key) else{
                    throw InventoryError.InvalidSelection
                }

                inventory.updateValue(item, forKey: selection)
            }
        }

        return inventory
    }

}

I still get the fatal error after making the corrections. Heres the full code.

import Foundation

enum VendingSelection: String { case soda case dietsoda case chips case cookie case sandwich case wrap case candyBar case popTart case water case fruitjuice case sportsDrink case gum

}

protocol VendingItem { var price: Double { get } var quantity: Int { get set } }

protocol VendingMachine { var selection: [VendingSelection] { get } var inventory: [VendingSelection: VendingItem] { get set } var amountDeposited: Double { get set }

init(inventory: [VendingSelection: VendingItem])

func vend(_ quantity: Int, _ selection: VendingSelection) throws

func deposit(_ amount: Double)

}

struct Item: VendingItem { let price: Double var quantity: Int }

enum InventoryError: Error { case invalidResource case conversionFailure case InvalidSelection }

class PlistConvertor { static func dictionary(fromFile name: String, ofType type: String) throws -> [String: AnyObject] { guard let path = Bundle.main.path(forResource: name, ofType: type) else { throw InventoryError.invalidResource }

    guard let dictionary = NSDictionary(contentsOfFile: path) as? [String: AnyObject] else {
        throw InventoryError.conversionFailure
    }

    return dictionary


}

}

class InventoryUnarchiver {

static func vendingInventory(fromDictionary dictionary: [String: AnyObject]) throws -> [VendingSelection: VendingItem] {

    var inventory: [VendingSelection:VendingItem] = [:]

    for (key, value) in dictionary{
        if let itemDictionary = value as? [String: Any], let price = itemDictionary["price"] as? Double, let quantity = itemDictionary["quantity"] as? Int{
            let item = Item(price : price, quantity : quantity)

            guard let selection = VendingSelection(rawValue: key) else{
                throw InventoryError.InvalidSelection
            }

            inventory.updateValue(item, forKey: selection)
        }
    }

    return inventory
}

}

class FoodVendingMachine: VendingMachine { let selection: [VendingSelection] = [.soda, .dietsoda, .chips, .cookie, .wrap, .sandwich, .candyBar, .popTart, .water, .fruitjuice, .sportsDrink, .gum ]

var inventory: [VendingSelection : VendingItem]
var amountDeposited: Double = 10.00

required init(inventory: [VendingSelection : VendingItem]) {
    self.inventory = inventory

}


func vend(_ quantity: Int, _ selection: VendingSelection) throws { }

func deposit(_ amount: Double) { }

}

What exactly is the error saying?

This is what it says next to the console that says fatal error.

aDecoder NSCoder 0x00007f8c7380ae00 self VendingMachine.ViewController 0x00007f8c71e0a770 error VendingMachine.InventoryError invalidResource dictionary [String : AnyObject]
inventory [VendingMachine.VendingSelection : VendingItem]

Is this after refactoring the code?

yes, after i put in the code you have given me

I did not refactor mine but I can give you the code if you would like. What is your email?

it's needthistech@gmail.com. thank you

Just sent it