What is the error?

the console is saying UnityEngine.Vector3' does not contain a constructor that takes `4' arguments

code:

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);
     }