Mechanize - подводные камни, не захватывается элементарная форма

<form name=qw action=/cgi-bin/ch/cht.pl method=POST>

<table><tr><td>
<table cellspacing=0 cellpadding=0>
<tr><td align=right><B>назовитесь:&nbsp </B></td><td><input class="l" type=text name=name size=9 maxlength=20></td></tr>
<tr><td align=right><B>пароль:&nbsp </B></td><td><input class="l" type=password name=pass size=9 maxlength=15></td></tr>
</table></td>
<td>&nbsp <B>цвет: </B></td>
<td align=right>
<table border=0 cellspacing=1 cellpadding=0 height=40>
<tr>

#!/usr/bin/ruby

require 'rubygems'
require 'hpricot'

require 'mechanize'

agent = Mechanize.new
agent.read_timeout = 60
#agent.idle_timeout = 60
agent.open_timeout = 60

page         = agent.get 'http://bizarre.kiev.ua/'
form         = page.form_with( :action => '/cgi-bin/ch/cht.pl' )


username_field = form.field_with(:name => "name")
username_field.value = "hhhfghfgh"

password_field = form.field_with(:name => "pass")
password_field.value = ""

agent.submit form

ругается

./rub.rb:17: undefined method `field_with' for nil:NilClass (NoMethodError)

это строка:

username_field = form.field_with(:name => "name")