Gameobject.find & my error NullReferenceException: Object reference not set to an instance of an object

Question

Hi I am trying to instantiate a prefab and add the prefab to a gameobject that already exists in the world. I have researched the error and it seems that I need to declare the gameobject I want to use as the parent in the start method but I am confused. Here is my code...

 void OnTriggerEnter(Collider collider)
 {
     GameObject stageSegment = Instantiate(A, new Vector3 (0,0,0), Quaternion.identity) as GameObject; 
     stageSegment.transform.parent = GameObject.Find("Stage Scroll").transform;
     Debug.Log(GameObject.Find("Stage Scroll"));
     
 }

And this is the error I get from the Debug.log output...

NullReferenceException: Object reference not set to an instance of an object LevelLoadingTrigger.OnTriggerEnter (UnityEngine.Collider collider) (at Assets/LevelLoadingTrigger.cs:78)

The gameobject I want to use as the parent already has a transform component so do I still need to declare it in Start and if so how do I go about declaring the gameobject I want to make the parent. The object instantiates just fine but it makes a clone of it in the hierarchy instead of becoming a child of my Stage Scroll game object - which only has a script attached to it and a transform component.

I am still new to learning C# and any help is much appreciated.

Answer 1

Answer by Kebabs · Dec 06, 2013 at 10:10 PM

OK guys it is now working :)

THANK YOU BOTH @chillersanium and @karlhulme

I just had to ctrl+z back to my default code from the start of the question, make A a public gameobject and now when the game is running it becomes a child of stage scroll!!!!!

Thank you both for the help!! I'm so new to coding and help like this inspires me to keep learning and understanding why code works/does not work. THANK YOU SOO MUCH!! This is for my studies so seriously again THANK YOU BOTH :)

 void OnTriggerEnter(Collider collider)
 {
     GameObject stageSegment = Instantiate(A, new Vector3 (0,0,0), Quaternion.identity) as GameObject; 
     stageSegment.transform.parent = GameObject.Find("Stage Scroll").transform;
     Debug.Log(GameObject.Find("Stage Scroll"));
     
 }

alt text

untitled-1.jpg (141.0 kB)

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chillersanim · Dec 06, 2013 at 10:15 PM 0

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Looks like somebody got happy :D

Was happy to help, for that is the Answers section.
Tipps for further questions:

Do give the full code
Also point out on which line the error is pointing (if you don't give the whole header to)
Perhaps try do debug first, in $$anonymous$$onoDevelop that is a real easy task

Greetings Chillersanim

Gameobject.find & my error NullReferenceException: Object reference not set to an instance of an object

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