How to make a ball jump

Hi, i started using Unity recently and i made the "Roll a Ball" Project. Then i tried to made some modifications such as make the ball jump. This is the code i have on my player script.
using UnityEngine;
using UnityEngine.UI;
using System.Collections;


public class PlayerController : MonoBehaviour {

public float speed;
public Text countText;
public Text winText;
public float jump;

private bool isFalling = false;
private Rigidbody rb;
private int count;


void Start ()
{
rb = GetComponent<Rigidbody>();
count = 0;

jump = 9;
SetCountText ();
winText.text = "";
}

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



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


rb.AddForce(movement * speed);


}



void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag ( "Pick Up"))
{
other.gameObject.SetActive (false);
count = count + 1;
SetCountText ();
}
}

void SetCountText ()
{
countText.text = "Count: " + count.ToString ();
if (count >= 9)
{
winText.text = "You Win!";
}
}
}

Then i saw on some other forums on the internet this modification in FixedUpdate that was supposed to work but it didn't for me.Plus some bollean ton ensure that i can only jump when i'm on ground.I get an error about addforce

Can anyone help?

• if(Input.GetKeyDown(KeyCode.Space)){

• this.rigidbody.AddForce(newVector3(0,jump,0));

• }

 

What error do you get?
This works for me

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. [RequireComponent (typeof (Rigidbody))] // force to use rigidbody
5. public class Jump : MonoBehaviour {
6.  
7.     public Vector3 direction = new Vector3(0.0f, 1.0f, 0.0f); // Jump direction
8.     public float force = 10.0f; // Force
9.  
10.  
11.     // Use this for initialization
12.     void FixedUpdate () {
13.         if (Input.GetButtonDown("Fire1")) // Button trigger
14.             this.jump ();
15.     }
16.  
17.     private void jump()
18.     {
19.         var rb = this.GetComponent<Rigidbody> ();
20.         if (rb != null)
21.         {
22.             rb.AddForce(this.direction * this.force, ForceMode.Impulse); // Use "force" as scalar for the directional vector
23.         }
24.     }
25. }