Question I'm so confused

I came across this error even though I'm pretty sure nothing is wrong with my script.

Error:
Assets\Scripts\MainMenu.cs(5,14): error CS0101: The namespace '<global namespace>' already contains a definition for 'MainMenu'

This is the script:

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.SceneManagement;
6.  
7. public class MainMenu : MonoBehaviour
8. {
9.     public void PlayGame()
10.     {
11.         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
12.     }
13.  
14. }
15.  

 

contains a definition errors sometimes mean one already exists. Check through your assets, and make sure you don't have another MainMenu.cs

 

You have another mainmenu script somewhere.

 

thx i didnt think of that