using root group on OSX with chef-apply

hello.rb

$ chef-apply test.rb
Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * file[hello.txt] action create
    * cannot determine group id for 'root', does the group exist on this system?
    ================================================================================
    Error executing action `create` on resource 'file[hello.txt]'
    ================================================================================

    Chef::Exceptions::GroupIDNotFound
    ---------------------------------
    cannot determine group id for 'root', does the group exist on this system?

    Resource Declaration:
    ---------------------
    # In test.rb

      1: file "hello.txt" do
      2:   content "Hello, world!"
      3:   mode "0644"
      4:   owner "root"
      5:   group "root"
      6: end

    Compiled Resource:
    ------------------
    # Declared in test.rb:1:in `run_chef_recipe'

    file("hello.txt") do
      action "create"
      retries 0
      retry_delay 2
      default_guard_interpreter :default
      path "hello.txt"
      backup 5
      atomic_update true
      declared_type :file
      cookbook_name "(chef-apply cookbook)"
      recipe_name "(chef-apply recipe)"
      content "Hello, world!"
      mode "0644"
      owner "root"
      group "root"
    end

[2015-03-26T00:33:04-07:00] FATAL: Stacktrace dumped to /Users/alexvinyar/.chef/cache/chef-stacktrace.out
[2015-03-26T00:33:04-07:00] FATAL: Chef::Exceptions::GroupIDNotFound: file[hello.txt] 
((chef-apply cookbook)::(chef-apply recipe) line 1) had an error: Chef::Exceptions::GroupIDNotFound: 
cannot determine group id for 'root', does the group exist on this system?

for the record, there is no root group, it's called wheel in OS X land.