Unable to transition to other animations on my Character Controller

Unity Engine
,
1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    //VAR
    [SerializeField] private float moveSpeed;
    [SerializeField] private float walkSpeed;
    [SerializeField] private float runSpeed;

    private Vector3 moveDirection;
    private Vector3 velocity;

    [SerializeField] private bool isGrounded;
    [SerializeField] private float groundCheckDistance;
    [SerializeField] private LayerMask groundMask;
    [SerializeField] private float gravity;

    [SerializeField] private float jumpHeight;

    //REF
    private CharacterController controller;
    private Animator anim;

    private void Start()
    {
        controller = GetComponent<CharacterController>();
        anim = GetComponentInChildren<Animator>();
    }

    private void Update()
    {
        Move();
    }

    private void Move()
    {
        isGrounded = Physics.CheckSphere(transform.position, groundCheckDistance, groundMask);

        if(isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

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

        moveDirection = new Vector3(0, 0, moveZ);
        moveDirection = transform.TransformDirection(moveDirection);

        if(isGrounded)
        {
            if (moveDirection != Vector3.zero && !Input.GetKey(KeyCode.LeftShift))
            {
                Walk();
            }
            else if (moveDirection != Vector3.zero && Input.GetKey(KeyCode.LeftShift))
            {
                Run();
            }
            else if (moveDirection == Vector3.zero)
            {
                Idle();
            }

            moveDirection *= moveSpeed;

            if (Input.GetKeyDown(KeyCode.Space))
            {
                Jump();
            }
        }

      

        controller.Move(moveDirection * Time.deltaTime);

        velocity.y += gravity * Time.deltaTime;
        controller.Move(velocity * Time.deltaTime);
    }

    private void Idle()
    {
        anim.SetFloat("Speed", 0);
    }

    private void Walk()
    {
        moveSpeed = walkSpeed;
        anim.SetFloat("Speed", 0.5f);
    }

    private void Run()
    {
        moveSpeed = runSpeed;
        anim.SetFloat("Speed", 1);
    }

    private void Jump()
    {
        velocity.y = Mathf.Sqrt(jumpHeight * -2 * gravity);
    }
}

I trying to get my character shift from an idle cycle to a walking/running cycle but I don’t know why it isn’t working. It kept prompting:

Parameter ‘Speed’ does not exist.
UnityEngine.Animator:SetFloat (string,single)
PlayerMovement:Idle () (at Assets/Script/PlayerMovement.cs:84)
PlayerMovement:Move () (at Assets/Script/PlayerMovement.cs:63)
PlayerMovement:Update () (at Assets/Script/PlayerMovement.cs:34)

Could someone help me please!

2

Make sure that your AnimationController has a “Speed” float parameter - name of that parameter has to be exact with correct casing.