Swift Value of protocol type 'XXX' cannot conform to 'Identifiable'; only struct/enum/class types can conform to protocols

I'm getting the following error:

Value of protocol type 'MenuProtocol' cannot conform to 'Identifiable'; only struct/enum/class types can conform to protocols

I have a main menu which some of its options have a submenu. I decided to use an enum for the main menu, and another enum for any submenus. All of the enums implement a protocol I defined, which allows me to specify the text that I'm going to show for each menu option.

I'm not sure if this is the best approach, but I found it useful.

Any ideas how can I fix this error? Thanks for your help!

Protocol MenuProtocol {
    var submenu: [OptionProtocol] { get }
}

protocol OptionProtocol {
    var name: String { get }
}

enum MainMenu: Int, Identifiable, CaseIterable, MenuProtocol, OptionProtocol {
    case One
    case Two
    case Three
    case Four
    case Five
    
    var id: Int { rawValue }
    
    var name: String {
        switch self {
        case .One:
            return "One"
        case .Two:
            return "Two"
        case .Three:
            return "Three"
        case .Four:
            return "Four"
        case .Five:
            return "Five"
        }
    }
    
    var submenu: [OptionProtocol] {
        switch self {
        case .One:
            return SubMenu1.allCases
        case .Two:
            return SubMenu2.allCases
        default:
            return []
        }
    }
}

enum SubMenu1: Int, Identifiable, CaseIterable, OptionProtocol {
    case SubMenu1_Option1
    case SubMenu1_Option2
    case SubMenu1_Option3
    case SubMenu1_Option4
    case SubMenu1_Option5
    
    var id: Int { rawValue }
    
    var name: String {
        switch self {
        case .SubMenu1_Option1:
            return "Submenu1 Option 1"
        case .SubMenu1_Option2:
            return "Submenu1 Option 2"
        case .SubMenu1_Option3:
            return "Submenu1 Option 3"
        case .SubMenu1_Option4:
            return "Submenu1 Option 4"
        case .SubMenu1_Option5:
            return "Submenu1 Option 5"
        }
    }
}

enum SubMenu2: Int, Identifiable, CaseIterable, OptionProtocol {
    case SubMenu2_OptionA
    case SubMenu2_OptionB
    case SubMenu2_OptionC
    case SubMenu2_OptionD
    case SubMenu2_OptionE
    
    var id: Int { rawValue }
    
    var name: String {
        switch self {
        case .SubMenu2_OptionA:
            return "Submenu2 Option A"
        case .SubMenu2_OptionB:
            return "Submenu2 Option B"
        case .SubMenu2_OptionC:
            return "Submenu2 Option C"
        case .SubMenu2_OptionD:
            return "Submenu2 Option D"
        case .SubMenu2_OptionE:
            return "Submenu2 Option E"
        }
    }
}

struct EnumProtTest: View {
    var body: some View {
        VStack {
            HStack {
                ForEach(MainMenu.allCases) { value in
                    Text("\(theName(value))")
                        .padding()
                        .background(Color.blue)
                }
            }
            
            HStack {
                TheContentView(data: MainMenu.One.submenu) { item in
                    Text("\(item.name)")
                        .padding()
                        .background(Color.purple)
                }
            }
            
            HStack {
                TheContentView(data: MainMenu.Two.submenu) { item in
                    Text("\(item.name)")
                        .padding()
                        .background(Color.purple)
                }
            }
        }
    }
}

struct TheContentView<Data: RandomAccessCollection, ElementView: View>: View where Data.Element: Identifiable, Data.Element: Hashable {
    
    var data: Data
    var itemView: (Data.Element) -> ElementView
    
    var body: some View {
        ForEach(data) { item in
            itemView(item)
                .padding()
                .background(Color.purple)
        }
    }
}