i am trying to make a platformer and i need help

Questions & Answers
1

i am trying to make a platformer and i need help to switch between Scenes/Levels but when i switch back to level 2 from level one y game freezes and you open the level selector by pressing escape or dying,I am trying to make a Platformer in unity and i need to switch between scenes/levels but when i switch back to level 2 and try to switch to another level the game freezes,i am making a platformer and am trying to switch between scenes/ levels but once i switch back to level 2 and try to switch to a new level the game freezes

Code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{

    public PlayerController pc;

    public GameObject gameOverMenu;

    // Start is called before the first frame update
    void Start()
    {
        gameOverMenu.SetActive(false);
    }

    // Update is called once per frame
    void Update()
    {

        if (pc.isDead == true)
        {
            gameOverMenu.SetActive(true);
        }

    }

    public void Redo()
    {
        Debug.Log("Button was pressed!");
        RestartGame();
    }

    void RestartGame()
    {
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
    }

    public void Quit()
    {
        Application.Quit();
    }

    public void Lv1()
    {
        SceneManager.LoadScene("Lv1", LoadSceneMode.Single);
        pc.isDead = false;
    }

    public void Lv2()
    {
        SceneManager.LoadScene("Lv2", LoadSceneMode.Single);
        pc.isDead = false;
    }

    public void Lv3()
    {
        SceneManager.LoadScene("Lv3", LoadSceneMode.Single);
        pc.isDead = false;
    }

    public void Lv4()
    {
        SceneManager.LoadScene("Lv4", LoadSceneMode.Single);
        pc.isDead = false;
    }

    public void Lv5()
    {
        SceneManager.LoadScene("Lv5", LoadSceneMode.Single);
        pc.isDead = false;
    }
}
2

Have you all your scenes in build settings?
Also you can test SceneManager.LoadScene without LoadSceneMode.Single
like this:

SceneManager.LoadScene("LevelName");

It just load scene.