Cannot preview in this file - App may have crashed

Hi,

I am working with SwiftUI, and am new to Xcode, and Swift at all.

I did the SwiftUI essentials Tutorial, and done the Controls and Views part.

Now I am stuck on my own creation app.

I try to get data from an local .json file which I stored in the Resources folder.

In the preview View, I pass in the data of index 0, but while rendering the preview it always crashes, and cannot build a preview.

I almost copied all the files from the BuildingListsAndNavigations project.

This is my View where I try to post from the json file

import SwiftUI

struct UserRow : View {
    var user: User

    var body: some View {
        Text(user.name)
    }
}

#if DEBUG
struct UserRow_Previews : PreviewProvider {
    static var previews: some View {
        UserRow(user: userData[0])
    }
}
#endif

here is the data.swift file

import UIKit
import SwiftUI
import CoreLocation

let userData: [User] = load("users.json")

func load<T: Decodable>(_ filename: String, as type: T.Type = T.self) -> T {
    let data: Data
    
    guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
        else {
            fatalError("Couldn't find \(filename) in main bundle.")
    }
    
    do {
        data = try Data(contentsOf: file)
    } catch {
        fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
    }
    
    do {
        let decoder = JSONDecoder()
        return try decoder.decode(T.self, from: data)
    } catch {
        fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
    }
}

Why does it crash? Did I miss something?