Problems with enums and switches (C#)

I'm working on my enemy AI here. What I'm trying to do is something similar to the standard character controller, where it just has a current character state enum, but what I'm doing with it is have a switch for said enum where it tells it what animation to play.

 using UnityEngine;
 using System.Collections;
 
 enum EnemyState{IDLE = 0, WALK = 1, RUN = 2, ATTACK = 3, KILL = 4};
 
 public class EnemyBehavior : MonoBehaviour
 {
 
     public AnimationClip enemyIdle;//setting animations
     public AnimationClip enemyWalk;//walking
     public AnimationClip enemyRun;//running/chasing
     public AnimationClip enemyAttack;//attacking player
     public AnimationClip enemyKill;//killing player
     
     public Transform Player;//adds the player to the script
     
     public int WalkingSpeed = 1;//sets the normal walking speed
     public int RunningSpeed = 3;//sets the running (chase player) speed
     public int MaxDist= 15;//maximum distance the player can be before enemy stops chasing the player
     public int MinDist= 7;//how close the player can be to enemy for enemy to start chasing player
     EnemyState currentState;
     
     void Update()//when object enters the Sphere Collider (Chase Range)
     {
          if(Vector3.Distance(transform.position,Player.position) <= MaxDist)//if that object has the tag "Player"
         {
           transform.LookAt(Player);//Looks at the player
             currentState = EnemyState.RUN;
            transform.position += transform.forward*RunningSpeed*Time.deltaTime;//follows the player
         }else if(Vector3.Distance(transform.position,Player.position) >= MaxDist)
         {
             RoamAround ();
         }
         switch (currentState)
         {
             case IDLE:
                 animation.Play ("enemyIdle");
                 break;
             case WALK:
                 animation.Play ("enemyWalk");
                 break;
             case RUN:
                 animation.Play ("enemyRun");
                 break;
             case ATTACK:
                 animation.Play ("enemyAttack");
                 break;
             case KILL:
                 animation.Play ("enemyKill");
                 break;
             default:
                 animation.Play ("enemyIdle");
                 break;
         }
     }
     void RoamAround()
     {
         currentState = EnemyState.IDLE;
     }
 }

What I'm getting is errors like "The name `IDLE' does not exist in the current context" for every single EnemyState. What am I doing wrong? (I've tried adding the enum into the class, but it doesn't work like that either.)