NullReferenceException: Object reference not set to an instance of an object

I got similar problems and it was due to a few slight mistakes in the the tutorial videos (or maybe i missed steps)
Mistake 1: The Zombunny was not assigned the Layer "Shootable" - so shots just bounced off it.
Mistake 2: The Prefab HitParticles component was not copied to the zombunny child (Paste as new component bit same as for gun) - this caused the Null exception error in the enemyhealth script. I don't remember seeing the step in the tutorials that mentioned adding this particle to the zombunny.

 

I have the same problem --- what Fix it for me either restart the unity editor or
- i had both the child and the parent (including player , gun and gunbarrel) taged as player so when i untag the player character (the child) it works .
i hope that help anyone face the same problem after me

 

im trying to make it where when i walk into a box collider a bunch of zombies spawn at the spawn points but i just get this error any help

NullReferenceException: Object reference not set to an instance of an object
zombieSpawn.OnTriggerEnter (UnityEngine.Collider other) (at Assets/scripts/zombieSpawn.js:17)

Code (JavaScript):

1.  
2. var Zombie : Transform;
3. var ZombieSpawn1 : Transform;
4. var ZombieSpawn2 : Transform;
5. var ZombieSpawn3 : Transform;
6. var ZombieSpawn4 : Transform;
7. var ZombieSpawn5 : Transform;
8.  
9.  
10. public var ZombiesSpawned = 0;
11.  
12. function OnTriggerEnter (other : Collider) {
13.     if (other.tag == "Player")
14.     {
15.         if (ZombiesSpawned < 5)
16.             {
17.         Instantiate(Zombie, ZombieSpawn1.position, Quaternion.Identity);
18.         ZombiesSpawned += 1;
19.  
20.         }
21.     }
22. }

 

After testing this thing a ton, I believe it's a simple configuration issue. There is a checkbox in the Zombear and Hellephant Animator, "Apply Root Motion" checking this box and validating that the correct Enemy Attack, Enemy Health, and Enemy Movement scripts are called resolved this issue for me. Took forever to find.

 

I'm having the same error msg..

NullReferenceException: Object reference not set to an instance of an object
StoriesDialogManagers.StartDialogue (.StoriesDialog dialogue) (at Assets/Scripts/Dialogue/StoriesDialogManagers.cs:23)
StoriesDialogTrigger.Start () (at Assets/Scripts/Dialogue/StoriesDialogTrigger.cs:16)

here is my code in c#..

Code (csharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.SceneManagement;
6. using UnityEngine.UI;
7. public class StoriesDialogManagers : MonoBehaviour
8. {
9.     public Text nameText;
10.     public Text dialogueText;
11.     public string sceneName = "";
12.     private Queue<string> sentences;
13.     private void Start()
14.     {
15.         sentences = new Queue<string>();
16.     }
17.     public void StartDialogue(StoriesDialog dialogue)
18.     {
19.         nameText.text = dialogue.name;
20.         sentences.Clear();
21.         foreach (string sentece in dialogue.sentences)
22.         {
23.             sentences.Enqueue(sentece);
24.         }
25.         DisplayNextSentece();
26.     }
27.     public void DisplayNextSentece()
28.     {
29.         if (sentences.Count == 0)
30.         {
31.             EndDialogue();
32.             return;
33.         }
34.         string sentence = sentences.Dequeue();
35.         StopAllCoroutines();
36.         StartCoroutine(TypeSentence(sentence));
37.     }
38.     IEnumerator TypeSentence(string sentence)
39.     {
40.         dialogueText.text = "";
41.         foreach (char letter in sentence.ToCharArray())
42.         {
43.             dialogueText.text += letter;
44.             yield return null;
45.         }
46.     }
47.     public void EndDialogue()
48.     {
49.         SceneManager.LoadScene(sceneName);
50.     }
51. }
52.  
53.  

In Unity..



This is bit weird because this is the only scene that my code isn't working..

 

dont use "icode" tags, use "code" tags, it'll include the line numbers so we can see which line the error is being generated on.

Null reference errors only occur when you attempt to access a method or property of something that doesn't exist (i.e. its null and you're attempting to access it ).

Go to line 23, figure out which object is null, figure out why it's null.


Side note, having two different spellings of "sentence" isn't looking too great

 

Nice necro lol.

Anyway, make sure you don't have a 2nd script in your scene, just search "t:StoriesDialogManager" in the hierarchy.

 

https://docs.unity3d.com/Manual/NullReferenceException.html

 

I don't know what happen but what fixed the problem was I have created another EmptyGO and put the manager script and removed it from the other GO. Still weird because on my other scene, it works fine when the StoriesDialogManager and StoriesDialogTrigger are on the same GO. well hope this will help soon. thanks guys.

 

iam also gettting that issue

 

I was having a different problembut found that very helpful. Thanks!

 

Thank you Sir..

 

Hey Mike!

Sorry to bother with this but couldn't find an asnwer from the Google. Referring to the Unity 3d survival shooter lesson 9, where I should add PlayerHealthScript to the EnemyManager. The problem is when I try to drag&drop the Player-object from the hierarchy-view, i cannot add it to the corresponding place in the EnemyManager-Inspector-view? Plz Hlp! --Sigma

 

guys..i wanna ask something... iam still newbie in AR development so i took a tutorial pack on asset store name nightmare . iam still learn from here. so the question is when i want to test the AR there is a notice about
NullReferenceException: Object reference not set to an instance of an object
InputHandler.Update () (at Assets/myassests/Objek/Script/InputHandler.cs:10)
THE SCRIPT
using UnityEngine;
using System.Collections;

public class InputHandler : MonoBehaviour
{
void Update ()
{
if(Input.GetMouseButton(0))
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit rayCastHit;

if(Physics.Raycast(ray.origin, ray.direction, out rayCastHit, Mathf.Infinity))
{
Door door = rayCastHit.transform.GetComponent<Door>();
if(door)
{
door.PlayDoorAnim();
}
}
}
}

void OnGUI()
{
GUI.Label(new Rect(10, 10, 500, 20), "Click on the door to trigger the animations!");
}
}

 

Hello,

I have this error, and i have no idea from where it comes?
Can somone help me
NullReferenceException: Object reference not set to an instance of an object
GameController.Movement () (at Assets/Script/GameController.cs:60)
GameController.TimerInvoke () (at Assets/Script/GameController.cs:44)


using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class GameController : MonoBehaviour
{
public int maxSize;
public int currentSize;
public int xBound;
public int yBound;
public int score;
public GameObject foodPrefab;
public GameObject currentFood;
public GameObject snakePrefab;
public SnakeController head;
public SnakeController tail;
public int NESW;

public Vector2 nexPos;
// Start is called before the first frame update

void OnEnable()
{
SnakeController.hit += hit;
}
void Start()
{
InvokeRepeating("TimerInvoke", 0, .5f);
FoodFunction();
}
void OnDisable()
{
SnakeController.hit -= hit;
}

// Update is called once per frame
void Update()
{
ComChangeD();
}
void TimerInvoke()
{
Movement();
if (currentSize >= maxSize)
{
TailFunction();
}
else
{
currentSize++;
}
}



void Movement ()
{
GameObject temp;
nexPos =head.transform.position;
switch (NESW)
{
case 0:
nexPos = new Vector2(nexPos.x, nexPos.y + 1);
break;
case 1:
nexPos = new Vector2(nexPos.x+1, nexPos.y);
break;
case 2:
nexPos = new Vector2(nexPos.x, nexPos.y - 1);
break;
case 3:
nexPos = new Vector2(nexPos.x-1, nexPos.y);
break;
}

temp = (GameObject)Instantiate(snakePrefab, nexPos,transform.rotation);
head.Setnext(temp.GetComponent<SnakeController>());
head = temp.GetComponent<SnakeController>();


return;

}
void ComChangeD()
{
if(NESW!=2&& Input.GetKeyDown(KeyCode.W))
{
NESW = 0;
}
if (NESW != 3 && Input.GetKeyDown(KeyCode.D))
{
NESW = 1;
}
if (NESW != 0 && Input.GetKeyDown(KeyCode.S))
{
NESW = 2;
}
if (NESW != 1 && Input.GetKeyDown(KeyCode.A))
{
NESW = 3;
}
}

void TailFunction()
{
SnakeController tempSnake = tail;
tail = tail.GetNext();
tempSnake.RemoveTail();
}

void FoodFunction()
{
int xPos = Random.Range(-xBound, xBound);
int yPos = Random.Range(-yBound, yBound);

currentFood = (GameObject)Instantiate(foodPrefab, new Vector2(xPos, yPos), transform.rotation);
StartCoroutine(CheckRender(currentFood));
}

IEnumerator CheckRender(GameObject IN)
{
yield return new WaitForEndOfFrame();
if (IN.GetComponent<Renderer>().isVisible == false)
{
if (IN.tag == "Food")
{
Destroy(IN);
FoodFunction();
}



}
}

void hit(string WhatWasSent)
{
if (WhatWasSent == "Food")
{
FoodFunction();
maxSize++;
score++;
}
if (WhatWasSent == "Snake")
{
CancelInvoke("TimerInvoke");
Exit();
}

}
void Exit()
{
SceneManager.LoadScene(0);
}
}

 

NullReferenceException: Object reference not set to an instance of an object
PaddleController.TouchMove () (at Assets/Scripts/PaddleController.cs:39)
I dont know how to resolve it

my PaddleController file:


using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PaddleController : MonoBehaviour
{
// Start is called before the first frame update

Rigidbody2D rb;

public float moveSpeed;
private void Awake()
{
rb = GetComponent<Rigidbody2D>();

}

void Start()
{

}

// Update is called once per frame
void Update()
{

}

private void FixedUpdate()
{
TouchMove();
}

void TouchMove()
{
Debug.Log(Input.GetMouseButton(0));
if (Input.GetMouseButton(0))
{
Vector2 touchPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
if (touchPos.x < 0)
{
//move left
rb.velocity = Vector2.left * moveSpeed;


}
else
{
//move right
rb.velocity = Vector2.right * moveSpeed;

}
}
else
{
rb.velocity = Vector2.zero;
}


}
}


Ball file:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Ball : MonoBehaviour
{
Rigidbody2D rb;
public float bounceForce;

// Start is called before the first frame update

private void Awake()
{
rb = GetComponent<Rigidbody2D>();
}

void Start()
{

}

// Update is called once per frame
void Update()
{
if (Input.anyKeyDown)
{
startBounce();
}
}

void startBounce()
{
Vector2 randomDirection = new Vector2(Random.Range(-1, 1), 1);

rb.AddForce(randomDirection * bounceForce, ForceMode2D.Impulse);


}

private void OnCollisionEnter2D(Collision2D collision)
{
if (collision.gameObject.tag == "FallCheck")
{
GameManager.instance.restartGame();
}
}
}


GameManager file:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{

public static GameManager instance;

private void Awake()
{
instance = this;
}

// Start is called before the first frame update
void Start()
{

}

// Update is called once per frame
void Update()
{

}

public void restartGame()
{
SceneManager.LoadScene("BounceBall");
}
}

 

NullReferenceException: Object reference not set to an instance of an object
GoogleARCore.Examples.Common.DetectedPlaneGenerator.Update () (at Assets/GoogleARCore/Examples/Common/Scripts/DetectedPlaneGenerator.cs:64)

I also have the problem. But unable to rectify the problem. Please help.
I am trying to create a AR app using ground plane detection.

 

I'm having trouble and the error says NullReferenceException: Object reference not set to an instance of an object
EnemyAttack.Update () (at Assets/Scripts/Enemy/EnemyAttack.cs:49)


My Code:

using UnityEngine;
using System.Collections;

public class EnemyAttack : MonoBehaviour
{
public float timeBetweenAttacks = 0.5f;
public int attackDamage = 10;


Animator anim;
GameObject player;
PlayerHealth playerHealth;
EnemyHealth enemyHealth;
bool playerInRange;
float timer;


void Awake ()
{
player = GameObject.FindGameObjectWithTag ("Player");
playerHealth = player.GetComponent <PlayerHealth> ();
enemyHealth = GetComponent<EnemyHealth>();
anim = GetComponent <Animator> ();
}


void OnTriggerEnter (Collider other)
{
if(other.gameObject == player)
{
playerInRange = true;
}
}


void OnTriggerExit (Collider other)
{
if(other.gameObject == player)
{
playerInRange = false;
}
}


void Update ()
{
timer += Time.deltaTime;

if(timer >= timeBetweenAttacks && playerInRange && enemyHealth.currentHealth > 0)
{
Attack ();
}

if(playerHealth.currentHealth <= 0)
{
anim.SetTrigger ("PlayerDead");
}
}


void Attack ()
{
timer = 0f;

if(playerHealth.currentHealth > 0)
{
playerHealth.TakeDamage (attackDamage);
}
}
}

 

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
// This is a referance to the Rigidbody component called "rb"
public Rigidbody rb;

public float forwardForce = 2000f;
public float sidewaysForce = 500f;

// We marked this as "FixedUpdate" we are using it to mess with physics
void FixedUpdate()
{
rb.AddForce(0, 0, forwardForce * Time.deltaTime); // Add a forward force

if(Input.GetKey("d"))
{
rb.AddForce(sidewaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
}

if(Input.GetKey("a"))
{
rb.AddForce(-sidewaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
}

if(rb.position.y < -3f)
{
FindObjectOfType<GameManager>().EndGame();
}
}
}

mine says the
NullReferenceException: Object reference not set to an instance of an object
PlayerMovement.FixedUpdate () (at Assets/Scripts/PlayerMovement.cs:28)
I think the error is where i marked but i cant figure out what i did wrong

 

Please don't post the same question again and again to seven-year-old threads. It is actually explicitly against forum rules.

For null reference, the answer is always the same... ALWAYS. It's like war... war never changes. It is the single most common error ever.

Don't waste your life spinning around and round on this error. Instead, learn how to fix it fast... it's EASY!!

Some notes on how to fix a NullReferenceException error in Unity3D
- also known as: Unassigned Reference Exception
- also known as: Missing Reference Exception
- also known as: Object reference not set to an instance of an object

http://plbm.com/?p=221

The basic steps outlined above are:
- Identify what is null
- Identify why it is null
- Fix that.

Expect to see this error a LOT. It's easily the most common thing to do when working. Learn how to fix it rapidly. It's easy. See the above link for more tips.

This is the kind of mindset and thinking process you need to bring to this problem:

https://forum.unity.com/threads/why-do-my-music-ignore-the-sliders.993849/#post-6453695

Step by step, break it down, find the problem.

 

Im getting the same problolem how do i fix

 

Which of these three steps are you unable to perform?

- Identify what is null
- Identify why it is null
- Fix that.

Read the post directly above your post.

 

Hello, I am stuck with this error can anybody help me?
NullReferenceException: Object reference not set to an instance of an object
GvrTrackedController.OnEnable () (at Assets/GoogleVR/Scripts/Controller/GvrTrackedController.cs:166)
I am trying to make a VR classroom after adding GvrControllerPoiner the above error shows, please help me out.

 

I had an error in Unity console
NullReferenceException: Object reference not set to an instance of an object
GvrTrackedController.OnEnable () (at Assets/GoogleVR/Scripts/Controller/GvrTrackedController.cs:167)
please somebody help me out.

 

using UnityEngine;
using System.Collections;

public class PlayerHealth : MonoBehaviour
{
public float health = 100f; // A saúde do jogador.
public float repeatDamagePeriod = 2f; // Com que frequência o jogador pode ser danificado.
public AudioClip[] ouchClips; // Matriz de clipes para reproduzir quando o player está danificado.
public float hurtForce = 10f; // A força com que o jogador é empurrado quando machucado.
public float damageAmount = 10f; // A quantidade de dano a receber quando os inimigos tocam o jogador

private SpriteRenderer healthBar; // Referência ao renderizador de sprite da barra de saúde.
private float lastHitTime; // A hora em que o jogador foi atingido pela última vez.
private Vector3 healthScale; // A escala local da barra de saúde inicialmente (com saúde total).
private PlayerControl playerControl; // Referência ao script de controle do jogador.
private Animator anim; // Referência para o Animator no player


void Awake ()
{
// Setting up references.
playerControl = GetComponent<PlayerControl>();
healthBar = GameObject.Find("HealthBar").GetComponent<SpriteRenderer>();
anim = GetComponent<Animator>();

// Getting the intial scale of the healthbar (whilst the player has full health).
healthScale = healthBar.transform.localScale;
}


void OnCollisionEnter2D (Collision2D col)
{
// If the colliding gameobject is an Enemy...
if(col.gameObject.tag == "Enemy")
{
// ... and if the time exceeds the time of the last hit plus the time between hits...
if (Time.time > lastHitTime + repeatDamagePeriod)
{
// ... and if the player still has health...
if(health > 0f)
{
// ... take damage and reset the lastHitTime.
TakeDamage(col.transform);
lastHitTime = Time.time;
}
// If the player doesn't have health, do some stuff, let him fall into the river to reload the level.
else
{
// Find all of the colliders on the gameobject and set them all to be triggers.
Collider2D[] cols = GetComponents<Collider2D>();
foreach(Collider2D c in cols)
{
c.isTrigger = true;
}

// Move all sprite parts of the player to the front
SpriteRenderer[] spr = GetComponentsInChildren<SpriteRenderer>();
foreach(SpriteRenderer s in spr)
{
s.sortingLayerName = "UI";
}

// ... disable user Player Control script
GetComponent<PlayerControl>().enabled = false;

// ... disable the Gun script to stop a dead guy shooting a nonexistant bazooka
GetComponentInChildren<Gun>().enabled = false;

// ... Trigger the 'Die' animation state
anim.SetTrigger("Die");
}
}
}
}


void TakeDamage (Transform enemy)
{
// Make sure the player can't jump.
playerControl.jump = false;

// Create a vector that's from the enemy to the player with an upwards boost.
Vector3 hurtVector = transform.position - enemy.position + Vector3.up * 5f;

// Add a force to the player in the direction of the vector and multiply by the hurtForce.
GetComponent<Rigidbody2D>().AddForce(hurtVector * hurtForce);

// Reduce the player's health by 10.
health -= damageAmount;

// Update what the health bar looks like.
UpdateHealthBar();

// Play a random clip of the player getting hurt.
int i = Random.Range (0, ouchClips.Length);
AudioSource.PlayClipAtPoint(ouchClips, transform.position);
}


public void UpdateHealthBar ()
{
// Set the health bar's colour to proportion of the way between green and red based on the player's health.
healthBar.material.color = Color.Lerp(Color.green, Color.red, 1 - health * 0.01f);

// Set the scale of the health bar to be proportional to the player's health.
healthBar.transform.localScale = new Vector3(healthScale.x * health * 0.01f, 1, 1);
}
}

 

Please STOP posting to seven-year-old threads. It's against forum rules.

The code does NOT MATTER to anyone here and you do NOT NEED a post for null reference.

Here is why:

The answer is always the same... ALWAYS. It is the single most common error ever.

Don't waste your life spinning around and round on this error. Instead, learn how to fix it fast... it's EASY!!

Some notes on how to fix a NullReferenceException error in Unity3D
- also known as: Unassigned Reference Exception
- also known as: Missing Reference Exception
- also known as: Object reference not set to an instance of an object

http://plbm.com/?p=221

The basic steps outlined above are:
- Identify what is null
- Identify why it is null
- Fix that.

Expect to see this error a LOT. It's easily the most common thing to do when working. Learn how to fix it rapidly. It's easy. See the above link for more tips.

This is the kind of mindset and thinking process you need to bring to this problem:

https://forum.unity.com/threads/why-do-my-music-ignore-the-sliders.993849/#post-6453695

Step by step, break it down, find the problem.

Here is a clean analogy of the actual underlying problem of a null reference exception:

https://forum.unity.com/threads/nul...n-instance-of-an-object.1108865/#post-7137032

 

ALSO: remember Rule #1 about GameObject.Find():

Rule #1: DO NOT USE GameObject.Find();

 

Can some body help me with this error
NullReferenceException: Object reference not set to an instance of an object
how.OnMouseDown () (at Assets/how.cs:12)
UnityEngine.SendMouseEventsoSendMouseEvents(Int32)


here is the code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class how : MonoBehaviour
{
public Transform theDest;

void OnMouseDown() {
GetComponent<Rigidbody>().useGravity = false;
this.transform.position = theDest.position;
this.transform.parent = GameObject.Find("Destination").transform;
}


void OnMouseUp()
{
this.transform.parent = null;
GetComponent<Rigidbody>().useGravity = true;
}





}

the error pops up when i try to grab my object by left clicking

 

The answer is always the same... ALWAYS. It is the single most common error ever.

Don't waste your life spinning around and round on this error. Instead, learn how to fix it fast... it's EASY!!

Some notes on how to fix a NullReferenceException error in Unity3D
- also known as: Unassigned Reference Exception
- also known as: Missing Reference Exception
- also known as: Object reference not set to an instance of an object

http://plbm.com/?p=221

The basic steps outlined above are:
- Identify what is null
- Identify why it is null
- Fix that.

Expect to see this error a LOT. It's easily the most common thing to do when working. Learn how to fix it rapidly. It's easy. See the above link for more tips.

This is the kind of mindset and thinking process you need to bring to this problem:

https://forum.unity.com/threads/why-do-my-music-ignore-the-sliders.993849/#post-6453695

Step by step, break it down, find the problem.

Here is a clean analogy of the actual underlying problem of a null reference exception:

https://forum.unity.com/threads/nul...n-instance-of-an-object.1108865/#post-7137032

 

Closing. There are plenty of answers here and other threads. Please don't just post code and say "help!". The whole point of this forum is that all these answers and information is archived. Everything you need to know about your issue is addressed many times, (several in this thread alone).

Additionally, please use code tags and read the rules for proper posting etiquette.