roll a ball not rolling, code seems correct...

i followed along with the guy and when he had me test the ball, i couldnt get it to roll for the life of me, so i decided to copy and paste his code... ... ... IT STILL DOESNT WORK! one notable difference i can see is that for him in "Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);" the "0.0f" is a different color and for me it is the same color as all the text

 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);
     }
 }