...
ERROR: gem_package[passenger] (passenger_apache2::default line 48) has had an error
ERROR: gem_package[passenger] (/tmp/vagrant-chef-1/chef-solo-1/cookbooks/passenger_apache2/recipes/default.rb:48:in `from_file') had an error:
gem_package[passenger] (passenger_apache2::default line 48) had an error: NoMethodError: undefined method `join' for nil:NilClass
...

rvm_shell "passenger_module" do
  ruby_string "ruby-1.9.3-p194"
  code        "passenger-install-apache2-module --auto"
  creates node[:passenger][:module_path]
end