Cannot load scene: Invalid scene name (empty string) and invalid build index -1

Questions & Answers
1

Hi, I wanted to load a game scene that I created via a button in a menu but when I press the start button, I get this error message :

Cannot load scene: Invalid scene name (empty string) and invalid build index -1
UnityEngine.SceneManagement.SceneManager:LoadScene(String)
Menu:StartGame(String) (at Assets/Script/Menu.cs:10)
UnityEngine.EventSystems.EventSystem:Update()

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

public class Menu : MonoBehaviour
{
    public void StartGame(string Forêt)
    {
        SceneManager.LoadScene(Forêt);
    }

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

    public void ReturnMenu(string MenuLordara)
    {
        SceneManager.LoadScene(MenuLordara);
    }
}
2

Make sure the string being supplied to the method is the name of the level you’d like to load and not an empty string.

Also check: File > Build Settings > add scene to ‘Scenes In Build’ list.

As far as i know scenes are references by an ID [int] and when using a name [string] Unity does an internal lookup to find that ID, if a scene cant be found by that ID then it returns -1

3

You are passing an empty parameter. First, do this:

 public class Menu : MonoBehaviour
 {
     public void LoadNewScene(string sceneName)
     {
         SceneManager.LoadScene(sceneName);
     }
 
     public void ExitGame()
     {
         Application.Quit();
     }
 }

Now add the “LoadNewScene” method to your button’s “OnClick” event and write the name of the scene there. Make sure that you added your scenes in the build settings (File > Build Settings > Drag and drop your scenes assets to the “Scenes in Build” space) and that you wrote their names correctly.

4

I found ! It just miss the name of the level to load at the on click () ! Sorry for understanding if that’s what you were trying to say @Tobychappell

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