Why am I getting a Vagrant Puppet "Could not find declared class" Error?

Question

I am trying to use Puppet to set up a gitpull on a Vagrant. I am totally new to authoring Puppet manifests. I have some sample classes which output messages being recognized and working (see helloworld class and subclass in the code below.) But when I try to implement a module that handles git, I am receiving an error message.

*I do have the git module folder located under my manifests folder. Best approach is to take a look at my github link that shows the pp files and folder structure, and see it for yourself. It is here: https://github.com/jamorat/puppet-example *

Here is my site.pp file in its entirety:

class { 'sudo': }
class { 'helloworld': }

class sudo {
file { "/etc/sudoers":
    owner => 'root',
    group => 'root',
    mode  => '0440',
}
}

class{ git:
svn => 'installed',
gui => 'installed',
}

class helloworld {
 alert("this is alert. always visible")
 class { helloworld::whoa: }
}

class helloworld::whoa {
alert("another alert from whoa!")
}

Here is the error message:

Puppet::Parser::AST::Resource failed with error ArgumentError: Could not find declared class git at /tmp/vagrant-puppet-1/manifests/site.pp:15 on node vagrant-ubuntu-precise-64.wp.comcast.net

Probably the best idea is to see this in action. I have created a GitHub repo of the exact manifest I am using. It is here: https://github.com/jamorat/puppet-example

The manifests and git module are there. If you have Vagrant, this can be vagrant up and you will see the error for yourself. Would be cool to either receive an answer here and/or also as a commit (for which credit would still be given here for answer.)

Thank you so much!