Model not Showing

Hi, I have some problem with cloud recognition. The model using this script used to be displayed just right, but suddenly it does not display anymore. The application can read a marker, and get the metadata, I have confirmed that by displaying the metadata in the UI text. but the object is not displayed. I used setActive(true) to make the selected object diplayed while the other object is set to setActive(false) at the begining of the script. is there something I miss?

using UnityEngine;
using System.Collections;

public class SimpleCREventHandler : MonoBehaviour, ICloudRecoEventHandler {
	
	#region PRIVATE_MEMBER_VARIABLES
	
	//CloudRecoBehaviour reference to avoid lookups
	private CloudRecoBehaviour mCloudRecoBehaviour;
	//ImageTracker reference to avoid lookups
	private ImageTracker mImageTracker;
	private GameObject pet;
	private bool isRendered = false;
	private string markerOwner = "";
	private string[] userdata;
	#endregion // PRIVATE_MEMBER_VARIABLES
	
	
	#region EXPOSED_PUBLIC_VARIABLES
	
	public ImageTargetBehaviour ImageTargetTemplate;
	
	
	#endregion
	
	#region UNITY_MONOBEHAVIOUR_METHODS
	
	// Use this for initialization
	void Start () {
	
		//all pet setActive to false
		hideAllPets();       
		
		//register this event handler at the cloud reco behaviour
		CloudRecoBehaviour cloudRecoBehaviour = GetComponent<CloudRecoBehaviour>();
		if(cloudRecoBehaviour)
		{
			cloudRecoBehaviour.RegisterEventHandler(this);
		}
		
		//remember cloudRecoBehaviour for later
		mCloudRecoBehaviour = cloudRecoBehaviour;
	}
	
	#endregion // UNITY_MONOBEHAVIOUR_METHODS
	
	#region ICloudRecoEventHandler_IMPLEMENTATION
	#region CloudRecognitionRequiredFunction
	public void OnInitialized()
	{
		//get a reference to the Image Tracker and remember it
		mImageTracker = (ImageTracker)TrackerManager.Instance.GetTracker(Tracker.Type.IMAGE_TRACKER);
	}
	
	public void OnInitError(TargetFinder.InitState initError)
    {
    }
 
    public void OnUpdateError(TargetFinder.UpdateState updateError)
    {
    }
 
    public void OnStateChanged(bool scanning)
    {
		//If still scanning object, hide all pet
		if(scanning)
		{
			hideAllPets();
		}
    }
	#endregion //CloudRecognitionRequiredFunction
	
	private void OnTrackingFound()
	{
		
	}
	
	private void OnTrackingLost()
	{		
		
	}
	
	public void OnNewSearchResult(TargetFinder.TargetSearchResult targetSearchResult)
	{
		//duplicate the referenced image target
		GameObject newImageTarget = Instantiate(ImageTargetTemplate.gameObject) as GameObject;
		
		GameObject augmentation = null;
		
		markerOwner = targetSearchResult.MetaData;
		PlayerPrefs.SetString("markerOwner",markerOwner);
		
		StartCoroutine(getPlayerData(PlayerPrefs.GetString("markerOwner")));
		
		if(augmentation != null)
		{
			augmentation.transform.parent = newImageTarget.transform;
		}
		
		//enable the new result with the same ImageTargetBehaviour
		ImageTargetBehaviour imageTargetBehaviour = mImageTracker.TargetFinder.EnableTracking(targetSearchResult,newImageTarget);
		
	imageTargetBehaviour.gameObject.transform.Find(PlayerPrefs.GetString("mPetType")).gameObject.SetActive(true);
		
		
		if (imageTargetBehaviour != null)
		{
			//stop the target finder
			mCloudRecoBehaviour.CloudRecoEnabled = false;
		}
	}
	
	#endregion ICloudRecoEventHandler_IMPLEMENTATION
		
	// Update is called once per frame
	void Update () {		
		//enable back button to exit application
		if (Input.GetKeyDown ("escape")) {
			Application.LoadLevel(0);			
		}
	
	}
	
			
	private void hideAllPets()
	{
		GameObject[] pets = GameObject.FindGameObjectsWithTag("pet");
		
		foreach(GameObject element in pets)
		{
			element.SetActive(false);
		}
	}
	
	public bool isPetRendered()
	{
		//isRendered = true;
		return isRendered;
	}
	
	IEnumerator getPlayerData(string username)
	{
		PlayerPrefs.SetString("mPetName","");
		PlayerPrefs.SetString("mPetType","");
		PlayerPrefs.SetFloat("mPetSize",0);
		PlayerPrefs.SetFloat("mPetGrowth",0);
		PlayerPrefs.SetFloat("mPetHunger",0);
		
		WWWForm form = new WWWForm();
		form.AddField("hash","babingengkang");
		form.AddField("username",username);		
		
        WWW result = new WWW("i got the url right", form);
		
        yield return result;
		
		
		if(result.error != null)
		{
			print(result.error);
		}
		else
		{
			string reply = result.text;
			userdata = reply.Split(";"[0]);
			PlayerPrefs.SetString("mPetName",userdata[0]);
			PlayerPrefs.SetString("mPetType",userdata[1]);
			PlayerPrefs.SetFloat("mPetSize",float.Parse(userdata[2]));
			PlayerPrefs.SetFloat("mPetGrowth",float.Parse(userdata[3]));
			PlayerPrefs.SetFloat("mPetHunger",float.Parse(userdata[4]));
			PlayerPrefs.Save();
			isRendered = true;
			
			result.Dispose();
		}
		
		
		
	}
	
}