I am always getting an error.

import SwiftUI
struct navModifier: ViewModifier {
    func body(content: Content)-> some View {
        content
            .foregroundColor(.white)
            .font(.custom("Helvetica",size: 40) .weight(.bold))
            .shadow(color: .green, radius: 3, x: 2, y: 1)
            .padding(EdgeInsets(top: 10, leading: 10, bottom: 0, trailing: 0))
    }
}

extension View {
    func navMod() -> some View {
        self.modifier(navModifier())
    }
}

struct Questions {
    var questionLeft: Int

    init(questionLeft: Int){
        let questionRight = Int.random(in: 1...12)
        var actualAns: Int = questionLeft * questionRight
        self.questionLeft = questionLeft
       }
}

struct ContentView: View {
    @State private var noQ = ["1", "5", "10", "all"]
    @State private var userQ = 0
    @State var qLeft: Questions
    @State var passV = 1

    var body: some View {
        NavigationView {
            ZStack {
                LinearGradient(gradient: Gradient(colors: [Color.yellow, Color.red]), startPoint: .topTrailing, endPoint: .bottomTrailing)
                    .edgesIgnoringSafeArea(.all)

                VStack {
                    Text("Settings")
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .padding(EdgeInsets(top: -20, leading: 20, bottom: 0, trailing: 0))
                        .font(.system(size: 30, weight: .semibold, design: .rounded))

                    Section(header: Text("Which table you wanna practice?")) {
                        Picker("Select Table", selection: $qLeft.questionLeft) {
                            ForEach(1 ..< 13) {
                                Text("\($0) Table")
                            }

                        }
                        .padding(EdgeInsets(top: -50, leading: 0, bottom: 0, trailing: 0))
                    }
                    .padding(EdgeInsets(top: 20, leading: 10, bottom: 0, trailing: 0))
                    .frame(maxWidth: .infinity, alignment: .leading)

                    Section(header: Text("How many questions do you want to answer ?")) {
                        Picker(selection: $userQ, label: Text("Select Questions")){
                            ForEach(noQ, id: \.self){

                                Text($0)
                            }
                        }
                        .padding(EdgeInsets(top: -60, leading: 0, bottom: 0, trailing: 0))
                    }
                    .padding(EdgeInsets(top: 20, leading: 10, bottom: 0, trailing: 0))
                    .frame(maxWidth: .infinity, alignment: .leading)

                    Section {

                 //       NavigationLink("Click to Begin",destination: Play())
                           // .font(.system(size: 30, weight: .bold, design: .monospaced))
                         //   .foregroundColor(.white)
                    }

                    Spacer()
                }

            }.toolbar {
                ToolbarItemGroup(placement: .navigation){
                    Text("Tables App")
                        .navMod()
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
     let qLeft1: Questions
    static var previews: some View {
        ContentView(qLeft: Questions(questionLeft: Int()))
    }
}

Thank you the error i was getting was solved.