Can't enable lightbox for product gallery

I've enabled lightbox in WooCommerce settings (Settings->Products->View->Product gallery->enable), but it does not work. Instead I get the following error in console: "GET http://shop.flavio-c.com/wp-content/plu ... ettyPhoto/jquery.prettyPhoto.init.min.js?ver=2.5.5" and product pictures are opened in a separate window.
How can I solve it?
Here is the link to the exact page were I need to enable the Lightbox: http://shop.flavio-c.com/product/produc ... escription
StoreBox theme version is 1.8.
Thank you for your help!

Hello,

Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?

I've sent URL and credentials to you via PM.
Thank you in advance!

Any ideas?

Hi,

I've switched to default Twenty Fifteen theme and still the same issue, so it's not connected with our theme, please try to disable all plugins except WooCommerce - if that won't help, please describe the issue on WooCommerce forum.