`SwiftUI.FileExportOperation.Error error 0` with `fileExporter` and `NSImage`

You'll have to forgive me, I am still pretty new to Swift, but I'm really struggling to figure out what I'm doing wrong or how I can fix it. I'm working on an app that generates an image from some views and then exports that image, but it always returns this very vague error:

The operation couldn’t be completed. (SwiftUI.FileExportOperation.Error error 0.)

Here's most of the program:

import SwiftUI
import UniformTypeIdentifiers

struct ContentView: View {
    @State private var backgroundColor = Color.black
    @State private var fileExporterIsPresented = false
    @State private var image: NSImage?
    @State private var fileExporterErrorAlertIsPresented = false
    @State private var fileExporterErrorDescription: String?

    var body: some View {
        let wallpaper = Rectangle()
            .foregroundStyle(backgroundColor)
            .aspectRatio(16 / 9, contentMode: .fit)
        
        VStack {
            wallpaper
                .clipShape(.rect(cornerRadius: 10))
                .overlay {
                    RoundedRectangle(cornerRadius: 10)
                        .strokeBorder(.separator, lineWidth: 5)
                }
            ColorPicker("Background Color", selection: $backgroundColor, supportsOpacity: false)
            Button("Generate Wallpaper") {
                let renderer = ImageRenderer(content: wallpaper.frame(width: 3840, height: 2160))
                
                image = renderer.nsImage
                fileExporterIsPresented = true
            }
            .fileExporter(
                isPresented: $fileExporterIsPresented,
                item: image,
                contentTypes: [UTType.heic, UTType.png]
            ) { result in
                if case .failure(let error) = result {
                    fileExporterErrorDescription = error.localizedDescription
                    fileExporterErrorAlertIsPresented = true
                }
            }
            .alert("File Exporter Failure", isPresented: $fileExporterErrorAlertIsPresented, actions: {
                Button("OK") {}
            }, message: {
                if let fileExporterErrorDescription {
                    Text(fileExporterErrorDescription)
                }
            })
            .dialogSeverity(.critical)
        }
        .padding()
    }
}

#Preview {
    ContentView()
}