the error reads:
Error: Invalid arguments to addUser. addUser must either be run with a full user object or with a username, password, and roles array

but the fields aren't called username and password
instead they are called user and pwd

so when one tries to run the command again taking into account the feedback from error message they get the following error:
couldn't add user: "username" is not a valid argument to createUser

which must be deeply frustrating
also it's a bit confusing because they called addUser not createUser