I had hummingbird activated and it was working ok, but I deactivated and delete it and now the plugin is giving this error when it tries to scan.
(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)
My site is open for assistance