Thumbnails not loading

Hello there,

I installed the pro version of Easy Media Reader plug-in, added media and created galleries, but when I go to preview the page the thumbnails won’t load. I get the buttons for the different gallery categories, but there’s just a spinning busy icon, or whatever it’s called, in place of the thumbnails.

Here is a link to the page: https://www.catinaboxcreative.com/test_4/?page_id=22

Thank you in advance.

https://www.ads-software.com/plugins/easy-media-gallery/