WD message_notify: Could not send message using @title to user ID #

When installing using Drush SI i get the following:

vagrant@vlad:/var/www/site/docroot/commons/profiles/commons$ drush si commons --account-name=admin --account-pass=admin --db-url=mysql://vlad:wibble@localhost/commons -y
You are about to DROP all tables in your 'commons' database. Do you want to continue? (y/n): y
Starting Drupal installation. This takes a few seconds ...                                                                                                                                                   [ok]
WD acquia spi: Connect your site to a valid subscription on the Acquia Network to send SPI data                                                                                                              [error]
Installation complete.  User name: admin  User password: admin                                                                                                                                               [ok]
WD message_notify: Could not send message using @title to user ID 5.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 6.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 7.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 3.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 6.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 7.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 3.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 5.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 6.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 3.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 5.                                                                                                                                         [error]
WD message_notify: Could not send message using @title to user ID 7.