Unassigned Reference Exception, beginner coder

Hello! I’m a beginner coder and I’ve been using this yt tutorial to code top down movement

I keep getting this error:

UnassignedReferenceException: The variable anim of Move has not been assigned.
You probably need to assign the anim variable of the Move script in the inspector.
UnityEngine.Animator.SetFloat (System.String name, System.Single value) (at <96b8a6afc0034a048a05dda6aeede1d8>:0)
Move.Update 

My code is:

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

public class Move : MonoBehaviour
{
   private Rigidbody2D rb;

   public Animator anim;
   public float moveSpeed;
   
   public float x, y;
   private bool isWalking;

   private Vector3 moveDir;

   private void Start()
   {
        rb = GetComponent<Rigidbody2D>();
   }
   private void Update()
   {
        x = Input.GetAxisRaw("Horizontal");
        y = Input.GetAxisRaw("Vertical");

        if(x != 0 || y != 0)
        {
                anim.SetFloat("X", x);
                anim.SetFloat("Y", y);
                if(!isWalking)
                {
                    isWalking = true;
                    anim.SetBool("isMoving", isWalking);
                }
        }else
        {
                if(isWalking)
                {
                        isWalking = false;
                        anim.SetBool("isMoving", isWalking);
                        StopMoving();
                }
        }

        moveDir = new Vector3(x, y).normalized;
   }

   private void FixedUpdate()
   {
        rb.velocity = moveDir * moveSpeed * Time.deltaTime;
   }

   private void StopMoving()
   {
        rb.velocity = Vector3.zero;
   }
}

Thank you for any advice!

Hi. Did you assign an Animator to the variable, like what he did at 19:21 of the video? (drag GFX gameObject to the variable). This error occurs because you’ve made the anim variable public but you didn’t assign an Animator to it in the inspector.