UI buttons wont click in 1 scene.

hi I’ve got a problem I have 2 scenes in my game a TtitleScreen and Level1

in TitleScreen theres a Start Button that loads this script attached to a UIManager gameobject.

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

public class UIManager : MonoBehaviour {

    public void SinglePlayerStart()
    {
        SceneManager.LoadScene("Level1");
    }
    public void TitleScreenStart()
    {
        SceneManager.LoadScene("Title_Screen");
    }
}

and when I click the Start Game Button the game loads Level1

but when I try to go the other way around and create a button in Level1 to take me back to the TitleScreen the button wont push down at all it appears locked up and when I assign the onClick functions nothing happens as the button doesn’t even seem to register at all.

I have tried moving the button in front of the canvas or in the back of it but nothing seems to make the button activate whats causing this?

thanks

I figured it out I deleted my Eventmanger in that scene by accident