Can someone help me fix this bug?

The is the code I’m using:

#pragma strict

var rotationSpeed = 100;

function Update () 
{
	var rotation : float = Input.GetAxis ("Horizantal") * rotationSpeed;
	rotation *= Time.deltaTime;
	Rigidbody.AddRelativeTorque (Vector3.back * rotation);
}

and this is the error that shows up:
BCE0044: unexpected char: 0xFEFF

You need the Rigidbody component of the gameobject if you want to apply the force :

var rigidbody: Rigidbody = gameObject.GetComponent(Rigidbody ) as Rigidbody ;
rigidbody.AddRelativeTorque (Vector3.back * rotation);