Object reference error

Unity Engine
1

Hello everyone, I’m very new here and I’m trying to learn how to create simple games watching tutorial. But when I try to create a code in order to move my character this happens:

Here is my code:

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

public class Playerctrl : MonoBehaviour {

public float speed;

Rigidbody2D rb;

//Use this for initialization
void start () {
rb = GetComponent<Rigidbody2D> ();
}

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

}

void FixedUpdate(){
float move = Input.GetAxis ("Horizontal"); // a or left = -1 d or right = 1

rb.velocity = new Vector2 (speed * move, rb.velocity.y);
}
}

And when I lauch my game to test this out I have the error:
NullReferenceException: Object reference not set to an instance of an object
Playerctrl.FixedUpdate () (at Assets/Scripts/Playerctrl.cs:24)

Can you help me ?

2

Does the object have a rigidbody on it?

3

If my character is an object yes he does

4028344--349015--k.jpg
4028344--349015--k.jpg1920×1080 165 KB

4

The Start() method is capitalized while yours is start(). Thus, it doesn’t get called at the beginning and the rb variable isn’t assigned.
PS: It’s not recommended to modify the Rigidbody’s velocity directly. Better use either Transform.Translate() or Rigidbody.MovePosition():

5

Oh thank you so much it finally works!
Okok I see I’m just following tutorial that’s why :wink: