Slim Seo (cURL error 28)

This program is great but i i’m having a issue with the plugin when i do a health check on my site this error appears after checking all my plugins this is the only plugin causing the issue

The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error: [] cURL error 28: Operation timed out after 10001 milliseconds with 0 out of -1 bytes received

not sure what needs to be fixed

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