将变量传递给另一个场景的脚本

Question

我需要将一个场景的脚本中的变量发送到另一个场景的脚本。我一直得到“NullReferenceException：对象引用未设置为对象的实例”。我做错了什么？

public class FirstScript : MonoBehaviour {
    private int x = 1;
    OtherScript other;
    void Start () {
        other= GetComponent<OtherScript>();
    }
    private void AddToOther(){//is called when a button is pressed
        print ("AddToOther");
        other.ShowInt(x);//this is the offending line?
    }
//-------------------
public class OtherScript : MonoBehaviour {

    public int y;

    public void ShowInt(int a){
        y = a;
        print ("y " + y);
    }

// ------------- EDITED PART

public class FirstScript : MonoBehaviour {
        private int x = 1;
        OtherScript other;
        void Start () {
        }
        private void AddToOther(){//is called when a button is pressed
            print ("AddToOther");
            other = gameObject.AddComponent<OtherScript>();
            other.ShowInt(x);
        }

感谢您的链接，我试图寻找类似的问题，但找不到那个：）