Your theme (Jevelin ) contains outdated copies of some WooCommerce template files. These files may need updating to ensure they are compatible with the current version of WooCommerce. Suggestions to fix this:
Update your theme to the latest version. If no update is available to contact your theme author asking about compatibility with the current WooCommerce version.
If you copied over a template file to change something, then you will need to copy the new version of the template and apply your changes again.
We have released the below latest theme version 4.2.3 which is compatible with WooCommerce 3.6 version so please update the theme on your site to the latest version as described here https://support.shufflehound.com/updating-theme/