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The code for the video on "First person movement". doesn't work for me. Can anyone help?

Here's the code I wrote for moving around (the mouselook script works fine).

using System.Collections;

using System.Collections.Generic;

using UnityEngine;


public class PlayerMovement : MonoBehaviour

{

  public CharacterController controller;


  public float speed = 12f;

  public float gravity = -9.81f;

  public float jumpHeight = 3f;


  public Transform groundCheck;

  public float groundDistance = 0.4f;

  public LayerMask groundMask;


  Vector3 velocity;

  bool isGrounded;



  // Use this for initialization

  void Start()

  {


  }


  // Update is called once per frame

  void Update()

  {

    isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);


    if (isGrounded && velocity.y < 0)

    {

      velocity.y = 0f;

    }


    float x = Input.GetAxis("Horizontal");

    float z = Input.GetAxis("Vertical");


    Vector3 move = transform.right * x + transform.forward * z;


    controller.Move(move * speed * Time.deltaTime);


    if (Input.GetButtonDown("Jump") && isGrounded)

    {

      velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);

    }


    velocity.y += gravity * Time.deltaTime;


    controller.Move(velocity * Time.deltaTime);


  }

}

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