Getting NullReferenceExpection when I've built and run...

[Ellis]

So when I’m in the editor it’s all fine, no errors at all but when I build and run it’s just a black screen, I turned on the dev console and saw that I got “NullReferenceExpection: Object reference not set to an instance of an object”. I know what the error means when in the editor but I’ve never got it after I built the game.

I’m currently on a mac with the new os, maybe that’s why it’s not working? I’ve tried all the mac build options. Gonna try on my pc later today but if someone knows what may cause this I would be happy to know!

EDIT: It’s not working with the webplayer verision as well

EDIT 2: Added a 1 of how it looks when in the editor, building and playing the build.

EDIT 3: So I found out how to check the logs and found this:

NullReferenceException: Object reference not set to an instance of an object
at Brick.Update () [0x00068] in /Users/Something37/BrickBuster/Assets/Scripts/Brick.cs:36

(Filename: /Users/Something37/BrickBuster/Assets/Scripts/Brick.cs Line: 36)

Here is the code for that script:

using UnityEngine;
using System.Collections;

public class Brick : MonoBehaviour {
	public int health;
	public Material[] materialFromHealth;
	public float moveSpeed;
	public GameObject[] powerups;

	int scoreBoost = 1;
	GameObject ls;
	LevelSystem system;


	void Start(){
		ls = GameObject.FindWithTag("LevelSystem");
		system = ls.GetComponent<LevelSystem>();
	}


	void Update () {
		switch(health){ //Check how much health the brick has and change texture after that
			case 1:
			renderer.material = materialFromHealth[0];
			break;

			case 2:
			renderer.material = materialFromHealth[1];
			break;

			case 3:
			renderer.material = materialFromHealth[2];
			break;
		}

		if(system.ScoreBooster)scoreBoost=2;
		else if(!system.ScoreBooster)scoreBoost=1;

		if(health<=0){ //Checks if the brick is dead
			system.score += 40 * scoreBoost;
			system.bricksDestroyed += 1;
			system.PlayDeathSound();
			int powerup = Random.Range(0,15);
			if(powerup==0)Instantiate(powerups[0], transform.position, transform.rotation);
			if(powerup==1)Instantiate(powerups[1], transform.position, transform.rotation);
			if(powerup==2)Instantiate(powerups[2], transform.position, transform.rotation);
			if(powerup==3)Instantiate(powerups[3], transform.position, transform.rotation);
			if(powerup==4)Instantiate(powerups[4], transform.position, transform.rotation);
			if(powerup==5)Instantiate(powerups[5], transform.position, transform.rotation);
			Destroy(gameObject);
		}
		else if(system.LevelComplete)Destroy(gameObject);
	}


	void OnCollisionEnter(Collision other){
		if(other.gameObject.tag=="Player"){
			system.score += 10 * scoreBoost;
			health-=1;
		}

		foreach(ContactPoint contact in other.contacts){
			if(contact.thisCollider == collider){
				float sideSpeed = contact.point.x - transform.position.x;
				contact.otherCollider.rigidbody.AddForce(100f * sideSpeed,0,0);
			}
		}
	}
}

This is row 36:

        if(system.ScoreBooster)scoreBoost=2;
        else if(!system.ScoreBooster)scoreBoost=1;

//Elis

[tanoshimi]

I can’t see any problems with your code, but if the line if(system.ScoreBooster)scoreBoost=2; is failing with a NullReferenceException, that suggests to me that “system” is not being assigned correctly in the Start() function:

ls = GameObject.FindWithTag("LevelSystem");
system = ls.GetComponent<LevelSystem>();

So, do you definitely have a gameobject in the scene tagged “LevelSystem” and does it have a script component of type “LevelSystem”? The fact that this works in editor but not in build makes me think it could be a timing issue - are any of these object created dynamically and perhaps are not instantiated at the point you’re trying to reference them?

As a test, try commenting out the lines above and instead expose “system” as a public variable and manually assign its value in the inspector - does that fix the problem?