JSON / REST API loading issue

Hi, I was told by WeDevs Dokan support that my pages on the site aren’t loading (url not found error) because my REST API and JSON is not loading. I’m not sure exactly what that means to be honest, but I’d like some help to get my site up and running properly. It’s supposed to be a multi-vendor marketplace using WooCommerce and Dokan. Hosting is through Google Cloud Hosting, and they said to get support here.