I don't know why I'm getting this error message

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour

{

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

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

	Rigidbody.AddForce("movement");
}

}

(I’m doing the first tutorial, and even though I’ve gone step by step and checked my code over and over, it won’t let me save it) Anybody know why? I’ve never coded before in my life, I’m trying to learn, if you guys know of any recourses for beginners, that would also be helpful.

first of all, welcome.

second, if you’re referring to an error message, it’s ever so slightly useful to those trying to help that you post it!

that said, your error is the quotes around movement in line 8. It’s important that you follow tutorials EXACTLY.

also, in future, please mark all of the code within the code tags.