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我和一些朋友正在开发一个Unity游戏，无意中发现了主移动脚本中的一个错误。你们中的任何一个人可以帮助我吗？这是移动脚本的代码。我对第一个和第二个错误有问题，因为第三个重复变量已经被修复。我使用his tutorials进行游戏。Image of the error messages

using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UI;
using UnityEngine.Events;

public class Player : MonoBehaviour{
[SerializeField] float mouseSensitivity=3f;
[SerializeField] float movementSpeed=5f;
[SerializeField] float mass=1f;
[SerializeField] float acceleration=20f;
[SerializeField] Transform cameraTransform;

public event Action OnBeforeMove;

internal float movementSpeedMultiplier;

public bool IsGrounded=>controller.isGrounded;
public event Action<bool> OnGroundStateChange;
internal float movementSpeedMultiplier;
CharacterController controller;
internal Vector3 velocity;
Vector2 look;
bool wasGrounded;

PlayerInput playerInput;
InputAction moveAction;
InputAction lookAction;
InputAction sprintAction;

void Awake(){
    controller=GetComponent<CharacterController>();
    playerInput=GetComponent<PlayerInput>();
    moveAction=playerInput.actions["move"];
    lookAction=playerInput.actions["look"];
    sprintAction=playerInput.actions["sprint"];
}

void Start(){
    Cursor.lockState=CursorLockMode.Locked; //Locks Cursor//
}

void Update(){
    UpdateGround();
    UpdateGravity();
    UpdateMovement();
    UpdateLook();
}

void UpdateGround(){
   if(wasGrounded!=IsGrounded){
       OnGroundStateChange?.Invoke();
       wasGrounded=IsGrounded;
   }
}

void UpdateGravity(){
    var gravity=Physics.gravity*mass*Time.deltaTime;
    velocity.y=controller.isGrounded?-1f:velocity.y+gravity.y;
}

Vector3 GetMovementInput(){
    var moveInput=moveAction.ReadValue<Vector2>();
    var input=new Vector3();
    input+=transform.forward*moveInput.y;
    input+=transform.right*moveInput.x;
    input=Vector3.ClampMagnitude(input,1f);
    input*=movementSpeed*movementSpeedMultiplier;
    return input;
}

void UpdateMovement(){
    movementSpeedMultiplier=1f;
    OnBeforeMove?.Invoke();
    var input=GetMovementIput();

    var factor=acceleration*Time.deltaTime;
    velocity.x=Mathf.Lerp(velocity.x,input.x,factor);
    velocity.z=Mathf.Lerp(velocity.z,input.z,factor);

    controller.Move(velocity*Time.deltaTime);

}

void UpdateLook(){
    var lookInput=lookAction.ReadValue<Vector2>();
    look.x+=lookInput.x*mouseSensitivity;
    look.y+=lookInput.y*mouseSensitivity;

    look.y=Mathf.Clamp(look.y,-89f,89f);

    //Debug.Log(look);//
    
    cameraTransform.localRotation=Quaternion.Euler(-look.y,0,0);
    transform.localRotation=Quaternion.Euler(0,look.x,0);
}
}

我还将链接错误消息