(Unity ARfoundation Imagetracking) KeyNotFoundException: The given key was not present in the dictionary.

I'm trying to display a different prefab for each marker in Image Tracking. https://www.youtube.com/watch?v=I9j3MD7gS5Y

I made it with reference to the above video. But I get a KeyNotFoundException and an error.

Here is the code.↓ ーーーーーーーーーーーーーーーーーーーーーーー

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.XR; using UnityEngine.XR.ARFoundation;

[RequireComponent(typeof(ARTrackedImageManager))] public class ImageTracking : MonoBehaviour {

 [SerializeField]
 private GameObject[] placeablePrefabs;

 private Dictionary<string, GameObject> spawnedPrefabs = new Dictionary<string, GameObject>();
 private ARTrackedImageManager trackedImageManager;

 private void Awake()
 {
     trackedImageManager = FindObjectOfType<ARTrackedImageManager>();

     foreach (GameObject prefab in placeablePrefabs)
     {
         GameObject newPrefab = Instantiate(prefab, Vector3.zero, Quaternion.identity);
         newPrefab.name = prefab.name;
         newPrefab.SetActive(false);
         spawnedPrefabs.Add(prefab.name, newPrefab);
     }
 }

 private void OnEnable()
 {
     trackedImageManager.trackedImagesChanged += ImageChanged;
 }

 private void OnDisable()
 {
     trackedImageManager.trackedImagesChanged -= ImageChanged;
 }

 private void ImageChanged(ARTrackedImagesChangedEventArgs eventArgs)
 {
     foreach (ARTrackedImage trackedImage in eventArgs.added)
     {
         UpdateImage(trackedImage);
     }
     foreach (ARTrackedImage trackedImage in eventArgs.updated)
     {
         UpdateImage(trackedImage);
     }
     foreach (ARTrackedImage trackedImage in eventArgs.removed)
     {
         spawnedPrefabs[trackedImage.name].SetActive(false);
     }
 }

 private void UpdateImage(ARTrackedImage trackedImage)
 {
     string name = trackedImage.referenceImage.name;
     Vector3 position = trackedImage.transform.position;
     
     //ここでKeyNotFoundException: The given key was not present in the dictionary.
     //「指定されたキーが辞書に存在しませんでした」と表示される
     GameObject prefab = spawnedPrefabs[name];
     prefab.transform.position = position;
     prefab.SetActive(true);

     foreach (GameObject go in spawnedPrefabs.Values)
     {
         if (go.name != name)
         {
             go.SetActive(false);
         }
     }
 }

}

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Does anyone know any solution?