Hummingbird Performance Report

I keep getting an error while running a Performance Test using Hummingbird. The error message 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 checking this on my live website and not on a local website. Unable to figure out why this might be.