Bizarre NullReferenceException

Questions & Answers
1

The error: Object reference not set to an instance of an object, occurs in the commented line of the following code.

public class CarAlone : MonoBehaviour {

    public class WaypointsClass {
	    public Vector3 Waypoint;
	    public List<Vector3> Neighbors = new List<Vector3> ();
	}

	public GameObject Waypoints;
	public WaypointsClass[] WaypointsArray;
	public Transform[] Transforms;
	private WaypointsClass StartPoint, Destination;
	
	private CharacterController controller;
	bool PlayerStart = false;

	void Start () {
	    controller = GetComponent<CharacterController> ();
	    GetWaypoints ();
	}

	void GetWaypoints () {
		Transforms = Waypoints.GetComponentsInChildren <Transform> ().ToArray ();
		Array.Resize(ref WaypointsArray, Transforms.Length);
		for(i = 0; i < Transforms.Length; i++) {

			WaypointsArray_.Waypoint = Transforms*.position; //ERROR HAPPENS HERE!!!*_

* }*
* for (i = 0; i < WaypointsArray.Length; i++) {*
* for (j = 0; j < WaypointsArray.Length; j++) {*
_ if(WaypointsArray*.Waypoint != WaypointsArray[j].Waypoint) {
if (WaypointsArray.Waypoint.x == WaypointsArray[j].Waypoint.x || WaypointsArray.Waypoint.z == WaypointsArray[j].Waypoint.z) {
WaypointsArray.Neighbors.Add (WaypointsArray[j].Waypoint);
}
}
}
}
WaypChoice = (int)Mathf.Floor ((float)UnityEngine.Random.Range(0, WaypointsArray.Length - 1));
Destination = WaypointsArray [WaypChoice];
WaypChoice = (int)Mathf.Floor ((float)UnityEngine.Random.Range(0, WaypointsArray.Length - 1));
StartPoint = WaypointsArray [WaypChoice];
}*_

}

2

You are resizing WaypointsArray (line 23) but you also need to initialize their values before being able to set their properties. When you resize an array, the newly added items have value NULL.

I don’t know what WaypointsClass class is, but I can only try to give you a point:

for(i = 0; i < Transforms.Length; i++) {
	WaypointsArray *= new WaypointsClass();*

WaypointsArray_.Waypoint = Transforms*.position;
}*_