3D model is not displaying in CloudReco vuforia

I followed this link https://developer.vuforia.com/forum/faq/unity-how-can-i-augment-my-image-target-model and it's working on ImageTarget. But when i use the same script in cloud reco it's not working. I'm getting the url value from metadata but it's not showing as a 3D model.

 if(targetSearchResult.MetaData != null)
 {
 StartCoroutine(DownloadAndCache());
  
 //StartCoroutine(DownloadMyBundle(1.0F));
 }
  
 mTargetMetadata = targetSearchResult.MetaData;
  
 JSONObject json = JSONObject.Parse(mTargetMetadata);
  
 string type=json.GetString("type");
 url=json.GetString("overlay3d");
  
 IEnumerator DownloadAndCache() {
 while(!Caching.ready)
 yield return null;
  
 using (WWW www = WWW .LoadFromCacheOrDownload(url, Version)) {
 yield return www;
  
 if (www .error != null)
 throw new UnityException("WWW Download had an error: " + www .error);
  
 AssetBundle bundle = www .assetBundle;
 if (AssetName == "") {
 mBundleInstance = Instantiate (bundle.mainAsset) as GameObject;
 }
 else {
 mBundleInstance = Instantiate(bundle.Load (AssetName)) as GameObject;
 }
 }
 }