It seems there is an install issue on your site so please make sure the theme and plugin is installed properly. Please use this guide: https://www.wpion.com/members/theme-installation/ and make sure you do not change the default file structure of the theme. That includes child theme customization.
please disable all plugins except visual composer, clear cache and reset cdn files if you use it. Please also check any custom code you might have added to the theme panel or the theme files. If you use a child theme, please switch to the main theme to make sure it does not affect the proper functionality of the theme.