PlalistThumbnail gives null

[rplabon]

`new GetPlaylistTitlesAsyncTask(mYouTubeDataApi) {
@OverRide
protected void onPostExecute(PlaylistListResponse playlistListResponse) {
// if we didn't receive a response for the playlist titles, then there's nothing to update
if (playlistListResponse == null)
return;

        mPlaylistTitles = new ArrayList();
        for (com.google.api.services.youtube.model.Playlist playlist : playlistListResponse.getItems()) {
            mPlaylistTitles.add(playlist.getSnippet().getTitle());

            Log.e("Titile", "" + "" + playlist.getSnippet().getTitle());
            Log.e("Thumbnail", "" + "" + playlist.getSnippet().getThumbnails().getDefault().getUrl());
        }
    }
}.execute(mPlaylistIds);`

[rplabon]

playlist.getSnippet().getTitle() gives the Title...
but Why
playlist.getSnippet().getThumbnails() gives null.
How can I get Thumbnail of a particular Playlist