getcwd not found: rails 1.1.6, file_column (svn)

Hi,

I get an "Errno::ENOENT No such file or directory - getcwd", after
finishing an upload process by the file_column plugin, and just before
a redirection.

The action which receives the POST with the upload information is

   def presentation
     (...)
     save_file(@presentation, params[:presentation])
     (...)
     redirect_to :action => 'admin'
   end

If I comment the save_file statement, redirect_to works, and no file
is uploaded, as expected. If I leave it uncommented, that's what it is
supposed to do:

  def save_file(array, parameters)
    if array.update_attributes(parameters)
      name = File.basename(array.file)
      name.gsub(/[^\w._-]/,'')
      array.name = name
      if array.save
      else
        flash[:notice] = "Error: array.save"
        return false
      end
    else
      flash[:notice] = "Error: array.update_attributes"
      return false
    end
  return true
  end

What it happens, instead, is: the file is uploaded, the database is
filled, but something goes wrong as the ENOENT error message appears
before the redirection is completed. I must restart lighttpd to reach
again the app.

It's really a weird problem. I have another file upload field under
the same controller and it just works fine...

The exception, exactly, claims:

Errno::ENOENT
No such file or directory - getcwd
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:269:in `expand_path'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:269:in `safe_load_paths'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:268:in `select'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:268:in `safe_load_paths'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:281:in `attempt_load'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:237:in `traverse_to_controller'
generated/routing/recognition.rb:3:in `recognize_path'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/
action_controller/routing.rb:511:in `recognize!'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in
`dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:
150:in `process_request'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:
54:in `process!'
/usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:600:in `each_cgi'
/usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:117:in `session'
/usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:104:in `each_request'
/usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:36:in `each'
/usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:597:in `each_cgi'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:
53:in `process!'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:
23:in `process!'

I don't know if it has to do with the safe_load_paths in routing.rb of
actionpack-1.12.5... if I should then upgrade to 1.2.3 of if there's
something I'm missing.

I've someone has encountered something similar, any help or insight is
much appreciated.

Thank you,
abelardo