Scripting error message

Im using the following script to extract the dataset from the OBB files:

using UnityEngine;
using System.Collections;
using System.IO;

public class ObbExtractor : MonoBehaviour {
  	
	void Start () {
		StartCoroutine(ExtractObbDatasets());
	}
	private IEnumerator ExtractObbDatasets () {
		string[] filesInOBB = {"tracker.dat", "tracker.xml"};
		foreach (var filename in filesInOBB) {
			string uri = Application.streamingAssetsPath + "/QCAR/" + filename;
			
			string outputFilePath = Application.persistentDataPath + "/QCAR/" + filename;
			if(!Directory.Exists(Path.GetDirectoryName(outputFilePath)))
				Directory.CreateDirectory(Path.GetDirectoryName(outputFilePath));
			
			var www = new WWW(uri);
			yield return www;
			
			Save(www, outputFilePath);
			yield return new WaitForEndOfFrame();
		}
		
		// When done extracting the datasets, Start Vuforia AR scene
		//Application.LoadLevel("ARScene");
	}
	private void Save(WWW www, string outputPath) {
		File.WriteAllBytes(outputPath, www.bytes);
		
		// Verify that the File has been actually stored
		if(File.Exists(outputPath))
			Debug.Log("File successfully saved at: " + outputPath);
		else
			Debug.Log("Failure!! - File does not exist at: " + outputPath);

		Application.LoadLevel("SceneMenu1");
	}
}

When I Build and Run onto the tablet, all works fine; the obb downloads, it pushes through to an empty scene that extracts the dataset, then it automatically loads the AR scene, augmenting a simple cube.

However, when I put this through Google Developer Console (in Alpha Testing and waiting to propagate) it does all the same but when it reaches the AR scene, it doesn’t augment anything.

When I run it in the Editor, I get the following error:

You are trying to load data from a www stream which had the following error when downloading.
malformed
UnityEngine.WWW:get_bytes()
ObbExtractor:Save(WWW, String) (at Assets/ObbExtractor.cs:34)
c__Iterator1:MoveNext() (at Assets/ObbExtractor.cs:25)

Does anyone know what the problem could be?

I’m working on the newest versions of Unity and Vuforia and started with a new project, following the tutorial found here: Tutorial Unity 4 apk splitting into OBB for google play

You could do with some help, but can only be bothered to bump? Why not post details of what you have tried in the last 24 hours to solve this problem?