Problem with a sample

Unity Engine
1

Hi, i started Unity this morning in a 2D sample game, UFO Project ([Archived] 2D UFO - Unity Learn)
in the fird video, in the physics scripts , they told to me to write:

private Rigidbody2D rb2d;
void start()
{
rb2d = GetComponent ();
}

void FixedUpdate() {
float moveHorizontal = Input.GetAxis (“Horizontal”);
float moveVertical = Input.GetAxis (“Vertical”);
Vector2 movement = new Vector2 (moveHorizontal, moveVertical);
rb2d.AddForce (movement);

}

but, the console when i exe the game say :
NullReferenceException: Object reference not set to an instance of an object
PlayerControler.FixedUpdate () (at Assets/TutorialInfo/Scripts/PlayerControler.cs:16)

Please help me because, i don’t know why…

2

Hello, please use Code Tags when pasting snippets into the forum.

That error means that there’s a variable in your code that is supposed to reference an object, but points to nothing. Your variable rb2d is supposed to point to a Rigidbody2D, but it’s pointing to nothing. That means that GetComponent() is returning null or not being executed.

This is most likely because you need to capitalize “Start()” or else it will not be called by Unity, so that GetComponent never gets called.