Error=NullReferenceExeption: Object reference not set to an instance of an object. Please Help!

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

private Rigidbody rb;

void start ()
{
rb = GetComponent<Rigidbody>();
}

void FixedUpdate ()
{
float moveHoziontal = Input.GetAxis("Horizontal");
float moveVertical = Input.GetAxis("Vertical");

Vector3 movement = new Vector3(moveHoziontal, 0.0f, moveVertical);

rb.AddForce (movement);
}
}
Im making my first game and its giving me this weird error NullReferenceExeption: Object reference not set to an instance of an object and im not sure what to do. Please help me I don't understand.

 

Null reference exceptions mean that you have a reference variable that has nothing assigned to it. You didn't say where the error is occurring, but I would assume it's the rigidbody causing it.

Since you're assigning to it using GetComponent, there must be a Rigidbody component attached to the same GameObject the PlayerController is on. If not, it won't be found and the rb reference will be null.

 

http://forum.unity3d.com/threads/using-code-tags-properly.143875/

 

c# is case sensitive

Start

not

start

 

And make sure the object does in fact have a rigidbody in it.

Also, if I'm not mistaken, you need to normalize your direction otherwise you'll be going faster when moving in angles.

Try this instead:

Code (csharp):

1.  
2.  
3. using UnityEngine;
4. using System.Collections;
5.  
6. public class PlayerController : MonoBehaviour {
7.  
8. private Rigidbody rb;
9. public float speed;
10.  
11. void start (){
12. rb = GetComponent<Rigidbody>();
13. }
14.  
15. void FixedUpdate (){
16.  
17. float moveHoziontal = Input.GetAxis("Horizontal");
18. float moveVertical = Input.GetAxis("Vertical");
19. Vector3 movement = new Vector3(moveHoziontal, 0.0f, moveVertical);
20.  
21. // Set the movement vector based on the axis input.
22. movement.Set (moveHorizontal, 0f, moveVertical);
23.  
24. // Normalise the movement vector and make it proportional to the speed per second.
25. movement = movement.normalized * speed * Time.deltaTime;
26.  
27. // Move the player to it's current position plus the movement.
28. rb.addForce (movement);
29.  

http://unity3d.com/learn/tutorials/projects/survival-shooter/player-character?playlist=17144

 

how would i connect the two together

 

and the error is in the line rb.addforce (movement);