on mouse down returns null exception error

Unity Engine
1

i am trying to move a football up when I click on it.its an 2D game. but I get an error saying “Null reference Exception:object reference not set to an instance of an object” here is the code I typed.

I am new to Unity as well as to scripting.

using UnityEngine;
using System.Collections;
public class playercontrol : MonoBehaviour
{
public int force;
private Rigidbody rb;
void start()
{
rb = GetComponent();

}
// Update is called once per frame
void Update ()
{
var dist = (transform.position - Camera.main.transform.position).z;
float lb= Camera.main.ViewportToWorldPoint (new Vector3(0, 0, dist)).x ;
float rb = Camera.main.ViewportToWorldPoint (new Vector3(1, 0, dist)).x ;
float bt= Camera.main.ViewportToWorldPoint (new Vector3(0, 0, dist)).y ;
float tp = Camera.main.ViewportToWorldPoint (new Vector3(0, 1, dist)).y;
var x = Mathf.Clamp(transform.position.x,lb,rb);
var y = Mathf.Clamp(transform.position.y,bt,tp);
var z = transform.position.z;
transform.position = new Vector3 (x, y, z);
}
void OnMouseDown()
{
rb.AddForce (transform.up*10f);
}
}

2

If I use debug.log in OnMouseDown function the script is working fine but AddForce is returning an error “object reference not set to an instance of the object”.
please help…thanks

3

You said its 2D so I guess you have a Rigidbody2D attached, but in your script your trying to call a normal Rigidbody

4

Thanks for the reply. Initially I tried with a rigid body 2D component. It gave the same error. So I removed the 2d component in the inspector and. Attached a normal rigid body component.
My object it an png picture file which I dragged into the scene view. Do I have to change any setting before using it as rigid body?

5

@Vionix , your void start()'s start() is in lowercase, assuming you copy and paste the whole code without editing, your Start function need to start with a capital S. Maybe that is the problem. Try void Start()

1 Like
6

yes you were right. thank you. I got it working:)