hummingbird cannot scan error

Hi,
I have support access on for aficreditsolutions.com.
Hummingbird is giving this error on a site and it is definitely not a local site. It's on a VPS.

Here is the error:
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