getting an error on drush make build

[patoshii]

sudo drush make build.make
Make new site in the current directory? (y/n): y
Project information for drupal retrieved. [ok]
drupal downloaded from http://ftp.drupal.org/files/projects/drupal-7.0.tar.gz. [ok]
Unable to clone commercedev from http://github.com/rszrama/commercedev.git. [error]