Erro noder

noderError

~ $ head 
noder  list
=> 
An exception occurred running /usr/local/bin/noder
    undefined method `<<' on nil:NilClass. (NoMethodError)

Backtrace:
  Kernel(NilClass)#<< (method_missing) at kernel/delta/kernel.rb:85
                     { } in Noder#list at /usr/local/bin/noder:94
                            Array#each at kernel/bootstrap/array.rb:71
                            Noder#list at /usr/local/bin/noder:93
                         Noder#execute at /usr/local/bin/noder:122
                       main.__script__ at /usr/local/bin/noder:132
      Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:67
      Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:91
               Rubinius::Loader#script at kernel/loader.rb:546
                 Rubinius::Loader#main at kernel/loader.rb:650
                 Rubinius::Loader.main at kernel/loader.rb:689
                     Object#__script__ at kernel/loader.rb:700



/usr/bin/env ruby -v
rubinius 1.2.1dev (1.8.7 006f5a1b 2010-12-21 JI) [i686-pc-linux-gnu]