I'm using the wordpress plugin and it was working fine.
For some reason, now the gallery is just showing blank.
I'm not sure when it happened, it may have been when I updated Wordpress to 4.9.8. I didn't check that page after the update.
Here is the URL that is having issues - https://milehighfleamarket.com/en/photo-gallery/

I also tried creating a new gallery on a test page for troubleshooting and received the attached error.

Thanks