Unity cant find the other script NullReferenceException: Object reference not set to an instance of an object

Question

So my TowerNode script cant find the Shop script and active or disable it for some reason it just cant find it so it give me a "NullReferenceException: Object reference not set to an instance of an object TowerNode.OnMouseDown () (at Assets/Scripts/TowerNode.cs:46)"

its cant make the Shop.Enable method on line 46

this is the TowerNode script

public bool IsShopOpen = false;
//Z position
public Vector3 positionOffSet;

//colors
public Color hoverColor;
private Color startColor;

//GameObjects
public GameObject turret;

//shop
public Shop shop;


//renderer!!
private Renderer rend;

//Build Manager
BuildManager buildManager;

 void Start()
{
    rend=GetComponent<Renderer>();
    startColor = rend.material.color;
    buildManager = BuildManager.instance;

    shop = GetComponent<Shop>();
    GameObject.Find("Shop");


}
//When mouse is on the turret node
void OnMouseDown()
{

    bool IsShopOpen = true;
     if (IsShopOpen == true)
    {

        shop.Enable();
    }


    if (EventSystem.current.IsPointerOverGameObject())
    {


        return;
    }
    if (!buildManager.CanBuild)
    {
        return;
    }
    if (turret != null)
    {

        Debug.Log("Cant Build Here!!!");
        return;
    }

    buildManager.BuildTurretOn(this);

}

public Vector3 GetBuildPosition()
{
    return transform.position + positionOffSet;
}

//when mouse get into the node space
void OnMouseEnter()
{
    rend.material.color = hoverColor;
    if (EventSystem.current.IsPointerOverGameObject())
    {
        return;
    }
    if (!buildManager.CanBuild)
    {
        return;
    }

}
//when mouse exit the node space
void OnMouseExit()
{
    rend.material.color = startColor;
}}

And this is the Shop script:

using UnityEngine; using UnityEngine.UI;

public class Shop : MonoBehaviour {

public TurretBlueprint Archery;
public TurretBlueprint Treb;
public TurretBlueprint Workamp;
public TurretBlueprint Barracks;

public Button Archeryy;
public Button Trebb;
public Button WorkCampp;
public Button Barrackss;

BuildManager buildManager;


void Start()
{
    buildManager = BuildManager.instance;
    disableAllButtons();
    //Enable();
}

public void SelectArchery()
{
    buildManager.SelectTurretToBuild(Archery);
    Debug.Log("archery!!!!");

}
public void SelectTreb()
{
    buildManager.SelectTurretToBuild(Treb);
    Debug.Log("Treb!!!!");
}
public void SelectWorkamp()
{
    buildManager.SelectTurretToBuild(Workamp);
    Debug.Log("Work Camp!!!!");
}
public void SelectBarracks()
{
    buildManager.SelectTurretToBuild(Barracks);
    Debug.Log("Barracks!!!!");
}


public void Enable()
{

    Archeryy.gameObject.SetActive(true);
    Trebb.gameObject.SetActive(true);
    WorkCampp.gameObject.SetActive(true);
    Barrackss.gameObject.SetActive(true);

}

public void disableAllButtons()
{
    Archeryy.gameObject.SetActive(false);
    Trebb.gameObject.SetActive(false);
    WorkCampp.gameObject.SetActive(false);
    Barrackss.gameObject.SetActive(false);
}}

Please don't tag your question is unnecessary tags. You are not using [unityscript], you are using [C#]. From the tag wiki: *`Do not use this tag to describe Unity scripts which are in C#: UnityScript is a separate language and should be used only on questions using that language.`* — Draco18s no longer trusts SE, Jan 08 '18 at 17:56

score 1 · Accepted Answer · answered Jan 08 '18 at 15:44

1

shop = GetComponent<Shop>();
    GameObject.Find("Shop");

I'm assuming the Shop script resides on the GameObject named Shop, and not the TowerNode GameObject, which would mean you should get the Shop script from that gameobject like so:

shop = GameObject.Find("Shop").GetComponent<Shop>();

answered Jan 08 '18 at 15:44

Brandon Miller

1,534
1
11
16

how do i get component without gameobject? like i need to getcomponent othe script but it does not include any gameobject, so its soing the same problem with the nullreference but i cant do it with gameobject also can u please help me? – Lian Levi Jan 11 '18 at 04:35
@LianLevi Components can *only* exist on GameObjects, your question makes no sense. – Draco18s no longer trusts SE Jan 11 '18 at 05:02
so if i wanna bring veraible from one script to another how do i do it? – Lian Levi Jan 11 '18 at 08:44
so if i wanna bring veraible from one script to another how do i do it? – Lian Levi Jan 11 '18 at 08:44
how can i bring veriable from one script to another? – Lian Levi Jan 11 '18 at 08:49

Unity cant find the other script NullReferenceException: Object reference not set to an instance of an object

1 Answers1