git::config define is not functional

[kostyrev]

my code:

$title = username
git::config { "set user.name for ${title}":
  value   => $git_user_name,
  config  => 'user.name',
  user    => $title,
  provider => 'global',
  require =>  [ User[$title], Group[$group] ],
}

produces error:

Error: /Stage[main]/users::Others/users::Add[perfilov]/Git::Config[set user.name for perfilov]/Exec[git_config_set user.name for perfilov]: Could not evaluate: Could not find command ''

centos 6.6
puppet-3.7.4-1.el6.noarch

[kostyrev]

my bad
I've forgotten to

include git