NullReferenceException

Questions & Answers
1

Can anyone explain to me why I am getting this error NullReferenceException object reference not set to instance of an object. Im getting this issue in my game so I came to the live training and started watching the Saving and loading data tutorial. Followed it step by step and I am getting the same error i had in my own game.

Here is my GameControl Script attached to a GameControl object

using UnityEngine;
using System.Collections;

public class GameControl : MonoBehaviour {

	public static GameControl control;

	public float health;
	public float exp;


	void OnGUI()
	{
		GUI.Label (new Rect (10, 10, 100, 30), "Health" + health);
		GUI.Label (new Rect (10, 40, 150, 30), "EXP" + exp);

	}

}

Here is the adjust script attached to the main camera

using UnityEngine;
using System.Collections;

public class AdjustScript : MonoBehaviour {

void OnGUI()
{
	if(GUI.Button(new Rect(10,100,100,30),"Health up"))
	{
		GameControl.control.health += 10;
	}

	if(GUI.Button(new Rect(10,140,100,30),"Health down"))
	{
		GameControl.control.health -= 10;
	}

	if(GUI.Button(new Rect(10,180,100,30),"Exp up"))
	{
		GameControl.control.exp += 10;
	}

	if(GUI.Button(new Rect(10,220,100,30),"Exp down"))
	{
		GameControl.control.exp -= 10;
	}

}

}

That is it, super simple and identical to the code in the video. I am getting the error but he is not. Please Help!!
Thank you

2

Add these line to your GameControl

void Awake (){
    control = this;
}

Basically you are not assigning a reference to control.