The error message is saying it doesn't know what openssl is. If you've installed open ssl, it's not on the path. You need to add the path to where you've installed openssl to your System Path.
I had this issue recently when one of my Photons lost it's keys. Check out this post
Be sure to close your command window and open a new instance after you set up openssl path in your System Path. The currently selected item in the bottom path of the window in the attached image
