Android texture AssetBundles loading problem

hi everyone, I'm trying to load images from an assetbundles but when I load the texture in the scene the image appear broken, I post the link at the file that I used to see if the problem is caused from some picture settings:

http://dev.x-project.it/bundles/AssetsTest.zip

In the file in the resources folder you can find the original image that i use for create the bundles. I'd like to know if the script that I use for export the bundles for the different device is correct, i post it below.

I cant load the bundle in the editor mode and i don't understand where is the mistake, you can find the script in the "app" gameobject, maybe is only a wrong path setting but i've tried all the possibilities and it doesn't works.

Another big problem is when i execute the "build and run" on Android device (Galaxy Tab 2) the application crashes immediately. in most cases the application when start, immediately minimize in the task bar so i have to reopen it again, sometimes more than one time before it works.

On WebPlayer everything works fine.

Any suggestion? Thanks in advance

 using UnityEngine;
 using System.Collections;
 
 public class ExampleLoadingBundle : MonoBehaviour {
 
     public GUIText label;
     public GUIText urlLabel;
     public GUITexture pic;
 
     public string url; // URL AssetBundle
     public int version = 1; // AssetBundle version
     
     public string assetName; // Name of the Asset to be loaded from the AssetBundle
     public string assetPath; // Path to the Asset in the Project folder
     
     Object ObjInstance; // Instance of the object
 
     string deviceFolder;
 
 
     GameObject obj;
     Texture2D texture;
 
     GameObject objects;
 
 
     void Awake(){
         #if UNITY_WEBPLAYER
         deviceFolder = "webplayer";
         #endif
         #if UNITY_ANDROID
         deviceFolder = "android";
         #endif
         
         url = "http://dev.x-project.it/bundles/" + deviceFolder + "/compositions2.unity3d";
         urlLabel.text = url;
         assetPath = "Assets/Resources/" + deviceFolder + "/compositions.unity3d"; 
     }
 
 
     void Start(){
         StartCoroutine(Download());
     }
 
 
     IEnumerator Download () {
         AssetBundleLoader assetBundleLoader = new AssetBundleLoader ();
         yield return StartCoroutine(assetBundleLoader.LoadBundle <Texture2D> (url, version, assetName, assetPath));
         if (assetBundleLoader.Obj != null) {
 
             texture = Instantiate (assetBundleLoader.Obj) as Texture2D;
             pic.texture = texture;
             //pic.pixelInset.x
             label.text = pic.name + " -- " + pic.pixelInset;
 
             Debug.Log (label.text);
         } else {
             label.text = " Load failed!";
 
             Debug.Log (label.text);
         }
     }
 
 
 }