Humminbird Not Scanning Site


I'm getting this error message when I try to run a performance report in Hummingbird and wondered if you were able to help please? My URL is

The performance test didn't return any results. This probably means you're on a local website (which we can't scan) or something went wrong trying to access WPMU DEV. Try again and if this error continues to appear please open a ticket with our support heroes.

I'm not sure what to do in this case but hopefully you can help.