My character won't jump

Unity Engine
1

I have tried several scripts but this is the one that has allowed me to get the character to fall:

public CharacterController controller;
    private Vector3 direction;
    public float speed = 8;
    private Vector3 moveDirection = Vector3.zero;
    public bool isGrounded;
    Vector3 moveVector;
    public Vector3 jump;
    public float jumpForce = 2.0F;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        jump = new Vector3(0.0f, 2.0f, 0.0f);
    }

    private Rigidbody rb;
    // Update is called once per frame
    void Update()
    {

        moveVector = Vector3.zero;
        float hInput = Input.GetAxis("Horizontal");
        direction.x = hInput * speed;

        if (controller.isGrounded == true && Input.GetKeyDown(KeyCode.Space))
        {
            rb.AddForce(jump * jumpForce, ForceMode.Impulse);
        }


        if (isGrounded == false)
        {
            //Add our gravity Vecotr
            moveVector += Physics.gravity;
        }

        controller.Move(moveVector * Time.deltaTime);
        controller.Move(direction * Time.deltaTime);
    }

    void OnCollisionEnter(Collision other)
    {
        isGrounded = true;
    }

    void OnCollisionExit(Collision other)
    {
        isGrounded = false;
    }

Please help me figure this out.

2

I wrote about this before: the Unity example code in the API no longer jumps reliably. I have reported it. Here is a work-around: