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Question by Paras17 · Apr 19, 2020 at 12:44 PM · assetbundle

unable to download assetbundle from firebase storage to unity

Hello, following error occured while downloading assetbundle from firebase storage.what should be the solution to this problem??

Error:NullReferenceException: Object reference not set to an instance of an object UnityEngine.Networking.UnityWebRequestAssetBundle.GetAssetBundle (System.Uri uri, System.UInt32 crc) (at :0) loadAsset+d__3.MoveNext () (at Assets/Scenes/scripts/ARScene/loadAsset.cs:40) UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at :0) UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator) loadAsset:Start() (at Assets/Scenes/scripts/ARScene/loadAsset.cs:34)

Here is the script used to download assetbundle from firebase storage

using UnityEngine; using UnityEngine.Networking; using System.Collections; using Firebase.Storage; using System.Threading.Tasks; using System;

public class downloadAsset : MonoBehaviour {

 public Uri downloadLink;   
 public  GameObject gameObj; 
 
 void Start()
 {
     //create reference to the file stored in firebase location that is supposed to be downloaded
       FirebaseStorage storage = FirebaseStorage.DefaultInstance;  
     
       StorageReference asset_ref = storage.GetReferenceFromUrl(firebase storage link);
    
     asset_ref.GetDownloadUrlAsync().ContinueWith((Task<Uri> task) =>
       {
           if (!task.IsFaulted && !task.IsCanceled)
           {
               Debug.Log("download link generated");
               Debug.Log("Download URL: " + task.Result);
               downloadLink = task.Result;
           }     
       });
     StartCoroutine(DownloadAsset(downloadLink));
 }

   IEnumerator DownloadAsset(Uri uri)
   {
       using (UnityWebRequest uwr = UnityWebRequestAssetBundle.GetAssetBundle(uri))
       {
           yield return uwr.SendWebRequest();
           
           if (uwr.isNetworkError || uwr.isHttpError)
           {
               Debug.Log(uwr.error);
           }
           else
           {
           
               AssetBundle bundle = DownloadHandlerAssetBundle.GetContent(uwr);
       

               GameObject instance = Instantiate(bundle.LoadAsset("cube", typeof(GameObject)), gameObj.transform) as GameObject;
           }
       }
   }
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