As I see the Revolution Slider plugin is activated in your WP Dashboard > Plugins section http://prntscr.com/egoxs1
Also you are using old theme and required plugins versions. Please update them to the latest ones.
Before update delete “woocommerce” folder in the directory wp-content/themes/legenda/ 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!