Pages don’t load if I add Grid Kit gallery/album to them

Hello,

I’ve just purchased and installed the Grid Kit plug-in. Unfortunately once I add a gallery/album in any page that page no longer loads (I get a blank black page). My WordPress version is 4.9.8 and I’m using the Archi – Interior Design WordPress Theme – https://themeforest.net/item/archi-interior-design-wordpress-theme/12649286

Thanks in advance!