Your theme (Adventura Child Theme) contains outdated copies of some WooCommerce template files. These files may need updating to ensure they are compatible with the current version of WooCommerce. You can see which files are affected from the system status page. If in doubt, check with the author of the theme.
Can you advise on this please
Hello 
Make sure you have the latest version of the theme installed. Your Downloads area will contain the more recent version of the theme the author has uploaded.
You may also want to reach out to the author. Their support information is here - https://themeforest.net/item/aventura-travel-tour-booking-system-wordpress-theme/20450670/support
Thanks!