Trouble running Examples

[ekmekjian]

I'm trying to implement some of the examples

import Foundation
import SwiftTUI
struct MyTerminalView: View{
        var body: some View{
                Text("Hello, World")
            }
    }

struct ContentView: View {
    @State var counter = 1
    var body: some View {
        VStack {
            Button("Add number") { counter += 1 }
            if counter > 1 {
                Button("Remove number") { counter -= 1 }
            }
            ForEach(1 ... counter, id: \.self) { i in
                Text("Number \(i)")
            }
            .border()
        }
        .padding()
    }
}
@main
public struct swiftodo {
    public static func main() {
    Application(rootView: ContentView()).start()
    }
}

but I'm having some trouble trying to get the code to run.
When I try to run this in Xcode I get the error

�[?1049h�[2J�[1;1H�[?25lSwiftTUI/Application.swift:141: Fatal error: Could not get window size
2023-02-15 12:12:24.571150-0500 swiftodo[33848:757148] SwiftTUI/Application.swift:141: Fatal error: Could not get window size
(lldb)

When trying to get this to run using swift run It gives me an error about @main with Users/black/swiftodo/Sources/swiftodo/swiftodo.swift:25:1: error: 'main' attribute cannot be used in a module that contains top-level code. So I remove the @main and swift run gives me no errors but doesn't execute the program. I did init the project as an executable. Any and all help appreciated.