[Rails] please suggest a web page automation tool

I've been trying to get a couple of web automation tools going today
and having a hard time. Seems like everything I try is outdated and
won't run on my environment. Mechanize seemed like a good one but it
doesn't want to run:

require 'rubygems'
require 'open-uri'
require 'mechanize'

agent = Mechanize.new

Results in:

D:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require':
126: The specified module could not be found. - D:/Ruby193/lib/ruby/
gems/1.9.1/gems/unf_ext-0.0.3/lib/unf_ext.so (LoadError)
from D:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
from D:/Ruby193/lib/ruby/gems/1.9.1/gems/unf-0.0.3/lib/unf.rb:4:in
`<top (required)>'

I've tried a few things to fix this, but I can't get mechanize to see
the unf_ext gem. Makes me think that it's a bit outdated.

What web automation framework would you recommend?

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