Having a issue with hiera

[guilherme]

In my manifest i've putted the simplest class:

class { 'nginx': }

The debug output:

Debug: template[/tmp/vagrant-puppet/modules-0/nginx/templates/nginx.conf.erb]: Bound template variables for /tmp/vagrant-puppet/modules-0/nginx/templates/nginx.conf.erb in 0.00 seconds
Error: Failed to parse template nginx/nginx.conf.erb:
Filepath: /usr/local/rvm/gems/ruby-1.8.7-p370/gems/puppet-3.0.0/lib/puppet/parser/scope.rb
Line: 240
Detail: Scope variable name is a FalseClass, not a string
at /tmp/vagrant-puppet/modules-0/nginx/manifests/config.pp:31 on node precise64.lan
Error: Failed to parse template nginx/nginx.conf.erb:
Filepath: /usr/local/rvm/gems/ruby-1.8.7-p370/gems/puppet-3.0.0/lib/puppet/parser/scope.rb
Line: 240
Detail: Scope variable name is a FalseClass, not a string
at /tmp/vagrant-puppet/modules-0/nginx/manifests/config.pp:31 on node precise64.lan
The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

cd /tmp/vagrant-puppet/manifests && puppet apply --verbose --debug --modulepath '/tmp/vagrant-puppet/modules-0' /tmp/vagrant-puppet/manifests/vagrant.pp

Puppet version 3.0.0

Anyone know how to solve it?