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It seems like you are using an outdated version of the theme, so we request you to update the theme to the latest version.
You can view this link for updating process: https://www.styledthemes.com/wordpress-tutorials/410-installing-updating-themes
Note: Please take a backup of your site before proceeding. Normally we use duplicator plugin to make a backup. https://wordpress.org/plugins/duplicator/.
Here is the video tutorials how to use duplicator and save it to your local computer https://www.youtube.com/watch?v=VdvOGV2eIjE
After you complete the update, then we will provide solution asap.