Please update the theme to the latest version and Woocommerce as well.
Before update delete “woocommerce” folder in the directory wp-content/themes/xmarket/ and it’ll be reuploaded from a new theme package.
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).
If you made any changes in the original theme files then you need create a child theme http://codex.wordpress.org/Child_Themes and copy modified files into there. After that you’ll be able to update the theme.