NullReferenceException help

Questions & Answers
1

im not sure what the problem is all i want is for it to spawn the gameobject and add velocity to it but i keep getting this error
here is the code

    using UnityEngine;
    using System.Collections;
    
    public class Fire_script : MonoBehaviour
    {
    
    	public GameObject bullet;				// Prefab of the bullet.
    	public float speed = 20f;				// The speed the bullet will fire at.
    	
    	
    	private follow_crosshairs playerCtrl;		// Reference to the PlayerControl script.
    
    
    	
    	void Start()
    	{
    		
    
    	}
    	
    	
    	void Update ()
    	{
    		// If the fire button is pressed...
    		if(Input.GetButtonDown("Fire1"))
    		{
    			{
 Getting NullReferenceException: Object reference not set to an instance of an object Fire_script.Update () (at Assets/Fire_script.cs:29)?


    				// ... instantiate the rocket facing right and set it's velocity to the right. 
    				Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,0))) as Rigidbody2D;
    				bulletInstance.velocity = new Vector2(speed, 0);
    		
    	}
    }
    	}
    	}

i do have the bullet working it just doesn’t add velocity it sort of just lands on the ground. please help if you can. C#

2

Be careful, Instantiate function give you in return an Object that you can cast as a GameObject but not as a component.

If you want the component of a specific GameObject, you should use GetComponent function or built-in properties.

Rigidbody2D bulletInstance = (GameObject)(Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,0)))).rigidbody2D;

or

GameObject bulletInstance = (GameObject)Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,0)));
bulletInstance.rigidbody2D.velocity = new Vector2(speed, 0);