Thanks for your quick response.
1. I already imported the slider, and it works 🙂
2. I have deleted WP Bakery Page Builder and Revolution Slider Plugin and re-install them from Jnews Dashboard. However, the plugin version installed are still the older version (WP Bakery Page Builder 5.4.3 and Revolution Slider 5.4.6). There are already available the newer version (WP Bakery Page Builder 5.4.4 and Revolution Slider 18.104.22.168.1). So there still notification balloon in my WP Dashboard plugin menu. Is it okay for the web security?