ArgumentException: The prefab you want to instantiate is null.

Questions & Answers
1

Hey guys,

I’m running into a problem. I have a script which instantiates a prefab, like this:

public class SegmentScript : MonoBehaviour {

 public GameObject bar_piece;
 private int start_height;
 private int end_height;
 private int score;
 private GameObject[] pieces;
 private Vector3 start_location;
 
 // Use this for initialization
 public void Start () {
 
 pieces = new GameObject[10];
 
 AddPieces(start_height, end_height);
 }
 
 public void AddPieces(int start, int end){
 
 for(int i = start;i<end;i++){
 Vector3 piece_location = start_location;
 piece_location.y = i;
 
 GameObject new_piece = Instantiate(bar_piece, piece_location, Quaternion.Euler(0,0,0)) as GameObject;
 pieces *= new_piece;*

}
}
}
Now, when I select the script in the inspector, I can drag and drop a prefab to the bar_piece slot. During runtime, I add this script through another script using the AddComponent function.
But somehow the prefab slot for bar_piece is empty again and I get the ArgumentException.
The weirdest part is that another script uses the exact same method to instantiate an object, but that works fine.

2

AddComponent will not copy linked objects to this component. it just adds an empty component. if you want to save link you should:

  1. add component in editor window
  2. attach all links you need to this component
  3. save gameobject with component to a prefab
  4. instantiate this prefab in runtime

second solution:

right after AddComponent attach all objects also in script like this:

addedComponent.someLinkToPrefab = this.someLinkToPrefab;