/**
     * Close Banner with given placementId
     *
     * placementId String
     */
    public void CloseBanner(string placementId)
    {
#if !UNITY_2019_1 && !UNITY_2019_2
        InvokeSafelyOnUIThreadAsync(delegate
        {
            sdk.CloseBanner(placementId);
        });
#else
        VungleLog.Log(VungleLog.Level.Error, VungleLog.Context.LogEvent, "VungleWindows.CloseBanner",
                      "2019.1 and 2019.2 crashes when instantiating a core class for banners, but it is fixed in 2019.3");
#endif
    }