Getting a 'CORS error' message when trying to load up a GeoJSON file

Initially, the file was loading up fine in Cesium Viewer last weekend when I first uploaded the file to my online File Manager (on HostGator). About several hours after that, the CORS error occurred and the file was no longer being loaded up. I spoke with HostGator customer service about it, and they ended up fixing it.

About a week passes, and the CORS error is showing up again. I’m not sure what exactly is causing this problem.

My subdomain, where CesiumJS is installed, is