Failed to produce diagnostic for expression when creating a list view in SwiftUI

Hello! I am new to SwiftUI. Recently I am trying to create a list view for my app. However, when I add the list view using ForEach, an error will show up saying "Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project". When I comment out the ForEach, everything back to normal. I have no idea what is wrong to the code. Hope someone can help me out! Thank you!

The code throw error:

Code Block Swift
struct PlaylistDetailView: View {
    var playlist: Playlist
    
    var body: some View {
        NavigationView{
            VStack{
                if playlist.songs.count == 0 {
                    Text("No Songs")
                } else{
                    Text("Have Songs")
                    List{
                        ForEach(playlist.songs){
                            item in
                            SongRow(song: item)
                        }
                    }
                }
            }
            .navigationTitle(playlist.name)
            .navigationBarTitleDisplayMode(.inline)
            .toolbar(content: {
                ToolbarItem(placement: .navigationBarLeading) {
                    Button(action: {}, label: {
                        Text("Edit")
                    })
                }
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button(action: {}, label: {
                        Image(systemName: "plus")
                    })
                }
            })
        }
    }
}

The error shows on line 2. If I comment out line 12-15, everything back to normal.

The definition of Playlist and Song is

Code Block Swift
struct Playlist: Codable, Identifiable {
    var id = UUID()
    
    var name: String
    var songs: [Song]
}
struct Song: Codable {
    var Name: String
    var URLs: URL
}

Code Block 
extension Song: Identifiable {
    var id: String {Name} //<- Please change this, if you know something better for `id`
}