(Solved): NullReferenceException: Object reference not set to an instance

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1

I’m stuck, the game runs but will not update the score and comes up with this:

NullReferenceException: Object reference not set to an instance of an object
ScoreKeeper.Reset () (at Assets/Scripts/ScoreKeeper.cs:25)
ScoreKeeper.Start () (at Assets/Scripts/ScoreKeeper.cs:13)

Which points to:
private Text mytext;

void Start(){
mytext = GetComponent();
Reset();
}
and:

public void Reset(){
	Debug.Log ("reset");
	score = 0;
	mytext.text = score.ToString();
}

These seem ok, which makes me think I’ve overlooked something in the UI but I can’t seem to find it myself

Including the lines changed from EnemyBehaviour (So you can see it isn’t that):

public int scoreValue = 150;

private ScoreKeeper scoreKeeper;

void Start(){
	scoreKeeper = GameObject.Find("Score").GetComponent<ScoreKeeper>();
}

In OnTriggerEnter2d:

scoreKeeper.Score(scoreValue);

I’m including pictures of the enemy

968×516 126 KB

and the Score

968×516 128 KB

So that hopefully someone can spot what I’m missing

Any ideas or help would be much appreciated

Cheers David

2

mytext has not been initialised.

If you look at your green screenshot you haven’t dragged it into the Inspector.

1 Like
3

Thanks for responding so quickly.

I tried moving it across however it still doesn’t update the score.

I also checked the code and mytext was supposed to be set as a private variable not a public one, it’s my mistake that it was there to begin with, Brice manages to get it working as a private variable just fine.

Any other ideas?

1 Like
4

Your Start() method is also a problem - myText = GetComponent() <- which component? What type?

If you are going to have myText as a private variable then try changing your Start() method to this;

private void Start() {

    myText = gameObject.GetComponent<Text>();
    Reset();
}

If it is the only game object of Type Text this should be ok.

5

I managed to sort it. I had assigned an older script to the enemyprefab that wasn’t getting updated, so when I changed the script, nothing happened. After changing the script it works fine.

I feel daft now :blush:

Thanks for all your help.

David

1 Like
6

Hehehe… we have all had a moment like that! :slight_smile:

Glad you got it sorted, well spotted and resolved :slight_smile: