Rigidbody2D Null Reference Exception after Instantiation

Questions & Answers
1

So basically, I’m writing a script that controls a spawner. It is pretty generic, and basically what it does is apply a force to an instantiated rigidbody after it is spawned. But for some reason, every time I spawn the object for the first time, Unity throws a NullReferenceException error. I checked my code for errata, but I think it is fine. Anyone got tips?

BTW, the exact error message was :

NullReferenceException: Object reference not set to an instance of an object
USBSpawner+c__Iterator0.MoveNext () (at Assets/Scripts/USBSpawner.cs:24)

Code:

using UnityEngine;
using System.Collections;

public class USBSpawner : MonoBehaviour {

	public static bool isActive = true;

	public GameObject USBPrefab;
	public float spawnDelay = 5f;
	public Vector2 throwForce;

	void Start() {
		StartCoroutine(SpawnUSB());
	}

	IEnumerator SpawnUSB () {
		yield return new WaitForSeconds(spawnDelay);

		if(isActive) {
			var newTransform = transform;

			Rigidbody2D USBInstance;
			USBInstance = Instantiate (USBPrefab, newTransform.position, Quaternion.identity) as Rigidbody2D;
			USBInstance.GetComponent<Rigidbody2D>().velocity = throwForce;
		}

		StartCoroutine(SpawnUSB());
	}
}

Got any ideas?

2

Make USBInstance to an GO then: ( Instantiate as GameObject as well)

USBInstance.GetComponent<Rigidbody2D>().velocity = throwForce;