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Question by Syllith · Jun 17, 2011 at 06:13 AM · charactercontrollernullreferenceexceptioncomponent

Object reference not set to instance of an object

Okay, I'm using the code:

 if (gameObject.Find("First Person Controller").GetComponent("CharacterMotor").grounded == false)
 {
 
 }

I copied and pasted t$$anonymous$$s code from an earlier working script. I'm 100% positive that the game object First Person Controller is there, and the component I'm trying to get is there. I also know the variable is correct, but I still get the error when I try to run the game saying "NullReferenceException: Object reference not set to an instance of an object". I have tried making a variable for it and putting the first person controller in it, then calling it from there, but I got the same error. Do you guys have any idea why I am getting t$$anonymous$$s error? Thanks

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Answer by CHPedersen · Jun 17, 2011 at 07:03 AM

The tough part about programming is that sometimes, our 100% certainty doesn't amount to 100% of the truth. ;)

If I were you, I'd build up that line of code with gradual Debug.Logs to see if the calls to GameObject.Find and GetComponent actually do return what you're 100% positive they do.

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avatar image Syllith · Jun 17, 2011 at 07:12 AM 0
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avatar image CHPedersen · Jun 17, 2011 at 07:21 AM 0
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avatar image Syllith · Jun 17, 2011 at 08:16 AM 0
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avatar image CHPedersen · Jun 17, 2011 at 08:30 AM 0
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avatar image CHPedersen · Jun 17, 2011 at 09:09 AM 1
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Answer by save · Jun 17, 2011 at 09:08 AM

You shouldn't use Find if that's inside Update, my tip is to first off variable "First Person Controller" (var fpc : Transform). Also later variable the whole fpc.GetComponent(CharacterController) in Start () as so:

 cController = fpc.GetComponent(CharacterController);

If it's an if ("boolean") you can also instead negate with:

 if (!fpc.cController.grounded)

The first steps will give you a real performance boost.

 var fpc : Transform;
 var cController;
 function Start () {
     cController = fpc.GetComponent(CharacterController);
 }
 function Update () {
     if (!fpc.cController.grounded) {
         //Character is jumping/falling
     }
 }

Hopefully t$$anonymous$$s might also solve your issue. Most of the times when t$$anonymous$$s happens it's because the variable you're trying to reach inside an object or the name of the object is called or spelled differently (I'm not familiar with the CharacterController class). I t$$anonymous$$nk that grounded is reached from the actual CharacterController instead of CharacterMotor though.

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