Unassigned Reference Exception on an Animator, but Animator is assigned in Inspector?

I'm getting an Unassigned Reference Exception in my script that references an Animator component. I assign the Animator to the script in the inspector, but it still returns the error.

Here is the script.

 using UnityEngine;
 using UnityEngine.UI;
 
 public class Currency : MonoBehaviour {
 
     public int startCoins;
     public int goldCoins;
     public DaylightCycle daylightCycle;
     private int lastDayCounted = 0;
     private int enemyDominions;
     private int lastEnemyDominionsCounted = 8;
     private int lastCoinCount;
     private bool wasProductive;
 
     [SerializeField]
     private Animator coinsAddedAnimator;
 
     public Text coinsAddedText;
 
     void Start()
     {
         goldCoins = startCoins;
         lastCoinCount = startCoins;
     }
 
 
     void Update()
     {
         //If it is the next day
         if (daylightCycle.dayCounter > lastDayCounted)
         {
             if (lastCoinCount + 200 <= goldCoins)
             {
                 wasProductive = true;
             }
 
             if (wasProductive)
             {
                 //Give Player 10 more Gold Coins
                 DistributeCoins(20);
             }
             
             lastCoinCount = goldCoins;
 
             //Make lastDayCounted the current day
             lastDayCounted = daylightCycle.dayCounter;
         }
 
         enemyDominions = GameObject.FindGameObjectsWithTag("EnemyDominion").Length;
 
         if (enemyDominions < lastEnemyDominionsCounted)
         {
             DistributeCoins(50);
 
             lastEnemyDominionsCounted = enemyDominions;
         }
 
     }
 
     public void DistributeCoins(int _amount)
     {
         goldCoins += _amount;
         coinsAddedText.text = "+" + _amount;
         coinsAddedAnimator.SetTrigger("CoinsWereAdded");
     }
 }

And here is the error.