Please update the theme to the latest version 2.9.
Before update delete “woocommerce” folder in the directory wp-content/themes/royal/ and it’ll be reuploaded from a new theme package.
Also update Revolution Slider and Visual Composer plugins http://www.8theme.com/download-plugins/ .
Don’t forget to create back up of your files and database before starting update process!
(it’s for Legenda theme but the process is the same).