I am developing a demo to practice swiftUI and Combine, I got error when I add group into a view as follows:

var body: some View {
        
        HStack {
            // TODO: Add image view

            Group{
                
                switch viewModel.state{
                case .loading:
                    print("")
                case .failed(let error):
                    print("")
                case .sucess(let image):
                    print("")
                }
            }
            
            VStack(alignment: .leading, spacing: 4) {
                
                Text(article.title ?? "")
                    .foregroundColor(.black)
                    .font(.system(size: 18, weight: .semibold))
                Text(article.source ?? "")
                    .foregroundColor(.gray)
                    .font(.system(size: 12, weight: .regular))
            }
        }
    }

Photo is as follows:

enter image description here

It’s strange, because I did the same in another view, it works well…

By the way, I want to use group because I want to use onAppear(perform: viewModel.loadImage(from: article.image)) as follow:

Group{
                
                switch viewModel.state{
                case .loading:
                    print("")
                case .failed(let error):
                    print("")
                case .sucess(let image):
                    print("")
                }
            }.onAppear(perform: viewModel.loadImage(from: article.image))

My object is to download one article image when the articleView(name of my class) appears, I think I can not use a function with parameters in onAppear? and If I want to download the article image when this articleView appear, How can I do it? can I use task to replace
onAppear? thanks a lot

I tried to organize my var body: some View and searched information in internet I can not find it, and the error Failed to produce diagnostic for expression; please submit a bug report is not clear