Error output

private_network{"ip"=>"192.168.20.3"}/opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/kernel_v2/config/vm.rb:226:in `network': wrong number of arguments (2 for 1) (ArgumentError)
	from /home/eedgar/git/vagrant/Vagrantfile:80:in `block (4 levels) in <top (required)>'
	from /home/eedgar/git/vagrant/Vagrantfile:77:in `each'
	from /home/eedgar/git/vagrant/Vagrantfile:77:in `block (3 levels) in <top (required)>'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/v2/loader.rb:37:in `call'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/v2/loader.rb:37:in `load'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/loader.rb:103:in `block (2 levels) in load'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/loader.rb:97:in `each'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/loader.rb:97:in `block in load'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/loader.rb:94:in `each'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/config/loader.rb:94:in `load'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/vagrantfile.rb:149:in `machine_config'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/vagrantfile.rb:45:in `machine'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/environment.rb:614:in `machine'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/plugin/v2/command.rb:168:in `block in with_target_vms'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/plugin/v2/command.rb:201:in `call'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/plugin/v2/command.rb:201:in `block in with_target_vms'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/plugin/v2/command.rb:200:in `map'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/plugin/v2/command.rb:200:in `with_target_vms'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/commands/status/command.rb:20:in `execute'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/cli.rb:42:in `execute'
	from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/environment.rb:301:in `cli'
	from /opt/vagrant/bin/../embedded/gems/gems/vagrant-1.7.2/bin/vagrant:174:in `<main>'

nodes.yaml

---
defaults:
   domain: vagrant.edgar.loc
   box: chef/ubuntu-14.10
   box_check_update: false
   networking:
     private_network:
         {ip: 192.168.20.3}
   synced_dirs:
       - guest: ./sync
       - host: /sync
       - nfs: true

nodes:
   client: {}
   #client2:
   #  ip: 10.6.0.5
   #  ports:
   #    - {guest: 5000, host: 5000}
   #    - guest: 5001
   #      host: 5000

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Defaults
# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"
Vagrant.require_version '>= 1.6.5'

# Requires
require 'yaml'

# Functions
def load_nodes()
  if File.exists?(File.dirname(__FILE__)+ '/../nodes.yaml')
     nodes_yaml_path = File.dirname(__FILE__)+ '/../nodes.yaml'
  else
     nodes_yaml_path = File.dirname(__FILE__)+ '/nodes.yaml'
  end
  nodes_cfg = YAML.load_file(nodes_yaml_path)
  return nodes_cfg
end

def get(key, global, node)
  node[key] || global['defaults'][key]
end


Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  nodes_cfg = load_nodes()
  nodes_cfg['nodes'].each do |vm_id, settings|
    config.vm.define(vm_id) do |cfg|
       # Skip this node if its disabled.
       if settings.has_key?('enable') and settings['enable'] != true
         next
       end

       # lookup values
       domain = get('domain', nodes_cfg, settings)
       box = get('box', nodes_cfg, settings)
       box_url = get('boxurl', nodes_cfg, settings) || ""
       box_check_update = get('box_check_update', nodes_cfg, settings) || false
       gui = get('gui', nodes_cfg, settings) || false
       ports = settings['ports'] || []
       synced_folders = nodes_cfg['defaults']['synced_folders'] || []
       synced_folders.concat(settings['synced_folders'] || [])
       ports = nodes_cfg['defaults']['ports'] || []
       ports.concat(settings['ports'] || [])
       n = nodes_cfg['defaults']['networking'] || []
       #networking.concat(settings['networking'] || [])

       provider = get('provider', nodes_cfg, settings)

       # Configure
       config.vm.provider "vmware_workstation" do |v, override|
          # Box
          if box
             override.vm.box = box
           end

           # Url
           if box_url
             override.vm.box_url = box_url
           end

           # Check the box update
           if box_check_update
             override.vm.box_url = box_check_update
           end

           # gui
           if gui
             override.vm.gui = gui
           end
       end

       # Networking
       n.each do |network, args|
          print network
          print args
          config.vm.network network, args
       end
       #config.vm.provider :aws do |aws,override|
       #  override.vm.box = "dummy"
       #  aws.tags =  {
       #   "Name" => "Vagrant-Phono",
       #   "Owner" => ENV['USER'],
       #   "CreatedAt" => Time.now.strftime('%Y-%m-%dT%l:%M:%S')
       #  }
       #end
       #  config.vm.provider "docker" do |d, override|
       #      d.image  = "phusion/baseimage-1410-salt"
       #      d.cmd    = ["/sbin/my_init", "--enable-insecure-key"]
       #      d.has_ssh = true
       #      override.ssh.username = "root"
       #      override.ssh.private_key_path = "key/phusion.key"
       #  end

       # Hostname
       cfg.vm.host_name = vm_id + '.' + domain

       # Configure Ports
       ports.each do |port|
         config.vm.network 'forwarded_port', guest: port['guest'], host: port['host']
       end

     end
   end
end


#  config.vm.synced_folder "pki/", "/etc/salt/pki/",
#    owner: "root",
#    group: "root",
#    mount_options: ["dmode=755,fmode=664"]

  # Provisioners
#  config.vm.provision "shell", path: "saltminion-bootstrap.sh"
  #config.vm.provision :salt do |salt|
  #    salt.run_highstate = true
  #    salt.no_minion = true
  #end