Object reference not set to an instance of an object: Can't seem to work things out

Question

I can't seem to figure out what I am doing wrong with this script. I can launch my game but whenever i am colliding with a pickup Unity closes the game and tells me there is a NullReferenceExeption going on. Been looking around for some time but can't seem to find an answer.

Here is the script ( Javascript ):

     // This script is supposed to find the GUI texture in my GUIpoint GameObject?
 // ( I think GUItextures are gameobjects? )
 
 
 
 static public var onPoint : boolean = false;
 
 static var DetectPoint : GameObject;
 
 DetectPoint = GameObject.Find("GUIpoint");
 
 
 static function hideTexture(){
 
 if(onPoint == true){
 
 
 DetectPoint.guiTexture.color.a = 255;
 
 yield WaitForSeconds (1);
 
 DetectPoint.guiTexture.color.a = 0;
 
 onPoint = false;
     
     }    
 
 }

EDIT:

The error is in the script that calls the coroutine:

 GetComponent(PointGet).StartCoroutine("hideTexure");

Many thanks in advance :)

Answer 1

Answer by kolban · May 27, 2012 at 08:56 PM

If the error is being reported in the line which reads:

 GetComponent(PointGet).StartCoroutine("hideTexture");

This tells me that either:

There is no such data type (Script) called "PointGet")
The object in which GetComponent() is being called doesn't have a component of type PointGet attached to it and hence returns "null". Since it returns null, the code is equivalent to:

null.startCoroutine("hideTexture");

Which would generate the runtime error you describe.

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rdanielsson · May 27, 2012 at 09:03 PM 0

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The script where the code is on is called "PointGet" and is attached to my gameobject which is a GUI texture. That is mostly why I simply can't find a reason for this null that is happening.

Answer 2

Answer by rdanielsson · May 27, 2012 at 11:23 PM

Solved this error by replacing this: ( EDIT: It didn't solve anything )

 GetComponent(PointGet).StartCoroutine("hideTexure");

With this:

 GetComponent(PointGet);
 
 PointGet.hideTexture();

2nd Edit:

I have replaced GetComponent(PointGet);

With:

 var PointGetScript: PointGet = GetComponent(PointGet);

No errors, but it doesn't start my hideTexture function as intended, Oh and it does display the guitexture when i delete the yield WaitForSeconds (1);in my PointGet script. I think I am triggering the coroutine wrong.

Edit #3:

The script where i am triggering the coroutine from looks like this:

 if(shipTrigCollision.gameObject.tag == "TrianglePickup"){
 
  
 PointGet.onPoint = true; // Sets the statement as true in our pointget script
 
 var PointGetScript: PointGet = GetComponent(PointGet);
 
 PointGetScript.hideTexture();
 
 
 audio.PlayOneShot(trianglePickupCollideSound);
     
      Destroy(shipTrigCollision.gameObject); // Destroys the game object we collided with last
      
      }

And the script where the coroutine is on looks like this:

 static public var onPoint : boolean = false;
 
 static var DetectPoint : GameObject;
 
 DetectPoint = GameObject.Find("GUIpoint");
 
 DetectPoint.guiTexture.enabled = false; // Disables guiTexture
 
 
 static public function hideTexture(){
 
 
 
 
 if(onPoint == true){
 
 
     DetectPoint.guiTexture.enabled = true;
 
     yield WaitForSeconds (1);
 
     DetectPoint.guiTexture.enabled = false;
     onPoint = false;
     
     }    
 
 }

Still very confused where the error is.

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whydoidoit · May 27, 2012 at 11:26 PM 0

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That line GetComponent(PointGet) is doing nothing at all. You already have a variable called PointGet, but GetComponent is called for a class not a variable - it's confusing because I bet your script is also called PointGet right?

rdanielsson · May 28, 2012 at 08:54 AM 0

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Yeah, I noticed it didn't do very much :p Yes, my script is called PointGet, Isn't it that script I am refering to?

whydoidoit · May 28, 2012 at 10:07 AM 0

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I think we need to see a bit more code to give it some context :) Can you edit the answer above or the question and post the code for both of the routines. You know how it is, it'll be something you missed in a bit you think is dead right, or something (that's what always happens to me, anyway!)

rdanielsson · May 28, 2012 at 10:23 AM 0

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Okay, i added both parts :)

Object reference not set to an instance of an object: Can't seem to work things out

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