Input System error

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.InputSystem;

public class AnimationAndMovementController : MonoBehaviour {

 PlayerInput playerInput;
 CharacterController characterController;
 Animator animator;

 Vector2 currentMovementInput;
 Vector3 currentMovement;
 bool isMovementPressed;

 void Awake()
 {
     playerInput = new PlayerInput();
     characterController = GetComponent<CharacterController>();
     animator = GetComponent<Animator>();

     playerInput.CharacterControls.Move.started += onMovementInput;
     playerInput.CharacterControls.Move.canceled += onMovementInput;
     playerInput.CharacterControls.Move.performed += onMovementInput;

 }

 void onMovementInput (InputAction.CallbackContext context)
 {
     
         currentMovementInput = context.ReadValue<Vector2>();
         currentMovement.x = currentMovementInput.x;
         currentMovement.z = currentMovementInput.y;
         isMovementPressed = currentMovementInput.x != 0 || currentMovementInput.y != 0;

 }

 // Update is called once per frame
 void Update()
 {
     characterController.Move(currentMovement * Time.deltaTime);
 }

 void OnEnable() 
 {

     playerInput.CharacterControls.Enable();
 }

 void OnDisable()
 {

     playerInput.CharacterControls.Disable();
 }

}

I am following a tutorial on Youtube and the code is the same with the tutorial but it keeps showing this error..may I know what should I do for solving this problem? Thank you for answering my question.

Assets\Scripts\AnimationAndMovementController.cs(54,21): error CS1061: 'PlayerInput' does not contain a definition for 'CharacterControls' and no accessible extension method 'CharacterControls' accepting a first argument of type 'PlayerInput' could be found (are you missing a using directive or an assembly reference?)