DCell: Communication with <node> interrupted

dcell test.rb

### node42.rb 
require 'dcell'

DCell.start :id => "node42", :addr => "tcp://127.0.0.1:2042",
  :registry => {
    :adapter => 'redis',
    :host    => '127.0.0.1',
    :port    => 6379
  }

loop { sleep 0.02 }

### node66.rb 
require 'dcell'
DCell.start :id => "node66", :addr => "tcp://127.0.0.1:2066",
  :directory => {
    :id   => 'node42',
    :addr => 'tcp://127.0.0.1:2042'
  }

loop { sleep 0.02 }

### node67.rb 
require 'rubygems'
require 'dcell'
DCell.start :id => "node67", :addr => "tcp://127.0.0.1:2067",
  :directory => {
    :id   => 'node42',
    :addr => 'tcp://127.0.0.1:2042'
  }

loop { sleep 0.02 }