NullReferenceException message, can't figure out why??

Hi, i'm very new to unity and Csharp. I've been following a tutorial on Youtube to create an endless runner game. I've got near to the end but hit this hurdle.

usingUnityEngine;
usingSystem.Collections;

publicclassSpawnHandler : MonoBehaviour {

publicGameObject[] stageCollection;

voidOnTriggerEnter2D(Collider2Dother)
{
if (other.gameObject.tag == "SpawnTrigger")
{
varstage = other.gameObject;
TransformspawnLocation = stage.transform.parent.Find("SpawnLocation");

GameObject obj = Instantiate(stageCollection[Random.Range(0, stageCollection.Length)], <--- this is the line
spawnLocation.position,
Quaternion.identity) asGameObject;

obj.name = "SpawnedStage";
}

if (other.gameObject.name == "SpawnLocation")
{
Destroy(other.gameObject.transform.parent.gameObject);
}
}
}


any help would be great, thanks!! this is the link to the tutorial

the bit i'm stuck on starts at 35:50.

 

Have you assigned anything into stagecollection?

 

When posting code, please use code tags.

 

yes I have, a prefab

 

Are you certain that there is always a GameObject named "SpawnLocation" at the same level of hierarchy as the GameObject that collided?

A.K.A are you certain that spawnLocation always has a value?

 

not sure, could you explain how I could check? sorry very new to this..

 

Just before the line giving you an error, insert:

Code (csharp):

1. Debug.Log("Spawn location? " + (spawnLocation != null ? "Exists!" : "Doesn't exist!") );

In the console just before the error, this will let you know whether spawnLocation exists or not.

 

Thanks very much, I'll try that. Thanks for your help