Roll A Ball Game Part 2 of 8 Tutorial Problem

I’m just starting off with Unity and am following the "Roll a Ball Game series from this website. I was able to get Part 1 of 8 but encountered errors while working on Part 2 despite copying the exact code. Any help would be much appreciated.

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

public float speed;

private Rigidbody rb;

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

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

	Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
	rb.AddForce(movement * speed);
}

}`

Errors:

-Assets/Scripts/PlayerController.cs(15,23): error CS0128: A local variable named `moveHorizontal’ is already defined in this scope

-All compiler errors have to be fixed before you can enter playmode!
UnityEditor.SceneView:ShowCompileErrorNotification()

Just got it working. Problem with the editor.