CS8025 parsing error

using UnityEngine; using System.Collections;

public class MenuManager : MonoBehaviour { public string CurrentMenu;

 void start () 
     
 {
     
     CurrentMenu = "Main"; 
 
 }
 
 void OnGUI()
 {
     if (CurrentMenu == "Main")
         Menu_Main();
     if (CurrentMenu == "Lobby")
         Menu_Lobby();
 }
 
 private void Menu_Main()
 {
 
         GUI.Button(new Rect(10, 10, 200, 50), "HostGame");
     
 }
 
 private void Menu_Lobby()
 {
 
 }

Please help me can´t figure it out