Plugin stopping images from uploading

Everything was working ok, but when trying to upload an image in the “Add Listing Form”, the image would not load. I deactivated all plugins and re-activated one at a time until I discovered that the Antispam Cleantalk plugin was the issue. When I deactivated the plugin I was able to upload an image. I tested this several times.

The page I need help with: [log in to see the link]