'Enemy' AnimationEvent 'Step' on animation 'Walk' has no receiver! Are you missing a component?

Hi, I've got an enemy (named "Enemy") which has a roaming function, and applied the same animation player has, he is properly walking around with this script, but every step, there is an error:
'Enemy' AnimationEvent 'Step' on animation 'Walk' has no receiver! Are you missing a component?
(Sorry for placing two issues in one thread)
Moreover, I have a problem with a script which should make an enemy follow a player when he enters enemy's collider, but it doesn't work.

Code (CSharp):

1. void Update()
2.     {
3.         if (isAlive && isTargetInReach)
4.         {
5.             followPlayer();
6.         }
7.         if (isAlive)
8.         {
9.             anim.SetBool("isWalking", agent.hasPath);
10.            
11.         }
12.         Roam();
13.     }

As like in the code above, when isAlive and isTargetInReach are true, enemy should follow player. If I remove isTargetInReach, it follows. But the code below which is applied to body of enemy and where "Enemy" is placed into Movement, doesn't even set isTargetInReach true.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class ColliderData : MonoBehaviour
6. {
7.     public EnemyMovement movement;
8.  
9.     private void OnTriggerEnter(Collider other)
10.     {
11.         if(other.gameObject.tag == "Player")
12.         {
13.             movement.isTargetInReach = true;
14.         }
15.     }
16.     private void OnTriggerExit(Collider other)
17.     {
18.         if (other.gameObject.tag == "Player")
19.         {
20.             movement.isTargetInReach = false;
21.             movement.GoBackToStartingPosition();
22.         }
23.     }
24. }
25.  

I checked, every tag is correct.
What could go wrong, tho?