Closure containing a declaration cannot be used with result builder 'ViewBuilder' and Struct 'ViewBuilder' declared here (SwiftUI.ViewBuilder)

An error appears and I don't know how to solve it : Closure containing a declaration cannot be used with result builder 'ViewBuilder'.

import SwiftUI

Struct ContentView: View {
var body: some View {

//   some code...

struct ContentView_Previews: PreviewProvider {   //    <-   error Closure containing a declaration cannot be used with result builder 'ViewBuilder'.

    static var previews: some View {

        ContentView()
  }
}

Struct Name: View {

//  some code ...

var body: some View {
Text"some text"

//  some code ...

Struct Name: View {
var body: some View {
Text"some text"

Struct Name: View {
var body: some View {
Text"some text"