I noticed that you can't use the security setup command before you have any controllers in place. It makes sense, but I would prefer if the error message that you got at first was more helpful.
Currently when you haven't created any controllers yet it says
which makes me think I typed the command wrong. Instead it should say something like "You can't set up security yet." or even "You must create a controller before you can set up security."
roo> security setup
Command 'security setup' not found (for assistance press TAB or type "hint" then hit ENTER)