NullReferenceException: Object reference not set to an instance of an object

Hi, I am trying to access a variable in an outside script but keep getting the

"NullReferenceException: Object reference not set to an instance of an object"

error message

I don't really understand why I am getting it or how to fix it. Any help and explanation would be greatly appreciated.

The error is occurring because of this code

"GameObject.Find("ScriptObject").GetComponent<QuestionsHolder>().isAskingQuestion = false;"

Thanks in advance!

========================================

public class IsAnswerCorrect : MonoBehaviour {

private Ray ray;
private RaycastHit rayCastHit;
public string correctKeyPress;

// Use this for initialization
void Start ()

{

}

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

if(Input.GetMouseButtonDown(0))
{
ray = Camera.main.ScreenPointToRay (Input.mousePosition);

if (Physics.Raycast (ray, out rayCastHit))
{
if(rayCastHit.transform.tag == correctKeyPress)
{
Debug.Log("correct");
GameObject.Find("ScriptObject").GetComponent<QuestionsHolder>().isAskingQuestion = false;
}
else
{
Debug.Log("wrong");
}

}

}

}

}

 

remove the space from Quest ionsHolder should be QuestionsHolder.
Also use code blocks for code.

If that fails try to break the code down:

Code (csharp):

1.  
2. GameObject.Find("ScriptObject").GetComponent<QuestionsHolder>().isAskingQuestion = false;
3.  

could be done like this to check for what is failing

Code (csharp):

1.  
2. GameObject go = GameObject.Find("ScriptObject");
3.    if (go != null){
4.     QuestionsHolder questionsHolder = go.GetComponent<QuestionsHolder>();
5.                   if (questionsHolder != null){
6.                        questionsHolder.isAskingQuestion = false;
7.                    }else{
8.                         Debug.Log("Could not find component QuestionsHolder");
9.                    }
10.     }else{
11.          Debug.Log("Culd not find GameObject ScriptObject");
12.     }
13.