In my script the Animation selection pop up shows no assets even though i have several?

I created a script for opening my doors in my level. The script needs an animator attached to it. I click the animator on the script the pop up screen that shows scenes and assets is empty. I have the animation and animator already made for the script but they dont show up in assets. i tried to drag them to the script on the animation box but it wont take it.

using UnityEngine;

public class SBDoorScript : MonoBehaviour {

 //made this public so that you can directly assign the door to the variable
 public Animator _animator;
 private bool _isInsideTrigger = false;


 void Start()
 {
     
 }


 void OnTriggerEnter(Collider other)
 {
     if (other.tag == "Player")
     {
         _isInsideTrigger = true;
     }
 }

 void OnTriggerExit(Collider other)
 {
     if (other.tag == "Player")
     {
         _isInsideTrigger = false;
         _animator.SetBool("open", false);
     }
 }

 // Update is called once per frame
 void Update()
 {
     if (_isInsideTrigger)
     {
         if (Input.GetKeyDown(KeyCode.E))
         {
 
         }
     }
 }

} this is the script. Please help immediately i have 2 days left for this level to be turned in from the date this is posted.