>> require "hpricot" => true >> doc = Hpricot('<p>foo1</p><p>foo2</p>') => #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}> >> doc.classes NoMethodError: undefined method `get_attribute' for #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}> from /usr/local/ruby-1.8.7/lib/rub…