hef::Mixin::Template::TemplateError: undefined method `each' for "65536":String

gistfile1.txt

The recipe:
# Cookbook Name:: worker
# Recipe:: instance-tuning
#
# Copyright 2012, Numenta, Inc.
#
# All rights reserved - Do Not Redistribute
#
limits = data_bag_item('limits', 'worker')

template '/etc/security/limits.conf' do
  source 'limits.conf.erb'
  owner 'root'
  group 'root'
  mode '0644'
  variables(
    :domains         => limits['domains']
  )
  action :create
end

The Databag:

{
  "id": "worker" ,
  "domains" : {
    "ec2-user": {
        "nofile": {
            "soft": "131072",
            "hard": "131072"
        },
        "nproc": {
            "soft": "65536",
            "hard": "65536"
      }
    }
  }
}

The Template:

#<domain>      <type>  <item>         <value>
#

#*               soft    core            0
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#@student        -       maxlogins       4
<% @domains.each do |domain, items| %>
  <% items.each do |item, types | %>
    <% types.each do |type, values| %>
      <% values.each do |value| %>
<%= "#{domain}".ljust(16) %> <%= "#{type}".ljust(8) %><%= "#{item}".ljust(16) %><%= "#{value}" %>
      <% end -%>
    <% end -%>
  <% end -%>
<% end -%>
# End of file