Importing particles at runtime with Asset Bundles

Hi, I’m trying to import a particle system using Unity Asset Bundles and it works in the editor but after building for Android (the whole project is just for Android) it stops working saying that what I’m trying to instantiate is null.
Here’s the code:
IEnumerator GetAssetBundle(string assetName) {
// Wait for the Caching system to be ready
while (!Caching.ready)
yield return null;

        // Load the files file from Cache if it exists with the same version or download and store it in the cache
        using (WWW www = WWW.LoadFromCacheOrDownload("file:///" + Application.persistentDataPath + "/" + assetName, 0)) { //looking for an asset bundle
            yield return www;
            if (www.error != null) {
                throw new UnityException("WWW download had an error:" + www.error);
            } else { // If it's an asset bundle
                AssetBundle bundle = www.assetBundle;
                var obj = bundle.LoadAsset(assetName) as GameObject;
                model = Instantiate(obj);
       = assetName;
                Debug.Log("Asset Bundle's model instantiated");
                bundle.Unload(false);   // Unload the AssetBundles compressed contents to conserve memory
        } // memory is freed from the web stream (www.Dispose() gets called implicitly)
        yield break;

Was wondering if it’s possible at all of I’m doing something wrong?

P.S. Also asked in the forums but no response so far so thought of trying my luck here.

Try to add used shader to “Always Included Shaders” in Edit → Project settings → Graphics menu. This needs to help.

In case if you use built-in Unity3D shader - download it an add manually to project/list.