Please clarify where you see that message. Show a screenshot of the problem.
Also you’re using old theme version.
Please update the theme to the latest version and Woocommerce as well.
Before update delete “woocommerce” folder in the directory wp-content/themes/royal/ and it’ll be reuploaded from a new theme package.
Also update all required 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).