RVM install error while using --add-to-rvm-group in a multiuser install

gistfile1.txt

user@debian:~$ \curl -L https://get.rvm.io | sudo bash -s head --add-to-rvm-group deploy
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   184  100   184    0     0    112      0  0:00:01  0:00:01 --:--:--   157
100 13171  100 13171    0     0   5326      0  0:00:02  0:00:02 --:--:--  5326
Downloading RVM from wayneeseguin branch master
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   124  100   124    0     0    126      0 --:--:-- --:--:-- --:--:--   200
100 3265k  100 3265k    0     0   307k      0  0:00:10  0:00:10 --:--:--  571k
Unrecognized option: /usr/local/rvm

  Usage:

    ./scripts/install [options]

  options:

    --auto-dotfiles   : Automatically update shell profile files.

    --ignore-dotfiles : Do not update shell profile files.

    --path    : Installation directory (rvm_path).

    --help    : Display help/usage (this) message

    --version : display rvm package version