The drush command 'hosts-add' could not be found.  Run `drush cache-clear drush` to clear the commandfile cache if you have installed new extensions.                                                                               [error]
A Drupal installation directory could not be found                                                                                                                                                                                  [error]
The following errors occurred when running "drush @aegir2.aegir2-dev hosts --fqdn=aegir2-dev.aegir2.local":                                                                                                                         [error]
aegir2-dev
Drush command terminated abnormally due to an unrecoverable error.                                                                                                                                                                  [error]