INTERESTING UPDATE 06/14/2020 – I have been using an iMac as my host system using VirtualBox for Kali. I also have a windows 10 desktop that has VirtualBox with a Kali image. out of the blue while restoring an iPhone backup on the iMac I loaded the windows 10 machine, started VirtualBox (had to update Vbox), started Kali, went to GitHub to get the link for Empire, did cd/opt then git clone, etc. loaded fine and ran the setup file once the clone was complete. Started Empire and it worked right away! so I am baffled but I got it working using the windows host machine!!!! go figure!!!