Hello,
You need update theme to 3.0.1 version.
The latest theme version you can download on Themeforest https://themeforest.net/item/royal-multipurpose-wordpress-theme/8611976?s_rank=3
It is compatible with WooCommerce 3.0.1.
You need to enter your purchase code to activate our new theme version and skip Setup Wizard.
Don’t forget to create backup of your files and database before starting update process!
Regards,
Rose Tyler.