In `method_missing': unknown property or method: `document' (NoMethodError)

Could someone explain what the following error means?

E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:488:in `method_missing': unknown property or method: `document' (NoMethodError)
HRESULT error code:0x80010108
  The object invoked has disconnected from its clients.
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/ie-class.rb:488:in `document'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/page-container.rb:31:in `page'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/page-container.rb:55:in `html'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/xpath_locator.rb:7:in `xmlparser_document_object'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/xpath_locator.rb:30:in `elements_by_xpath'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/locator.rb:111:in `locate_elements_by_xpath_css_ole'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/locator.rb:209:in `locate'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/input_elements.rb:5:in `locate'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/element.rb:63:in `assert_exists'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/element.rb:414:in `perform_action'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/element.rb:269:in `click!'
from E:/Ruby193/lib/ruby/gems/1.9.1/gems/watir-classic-3.0.0/lib/watir-classic/element.rb:211:in `click'

I use some code in which I need to make the following checks - if needed title is found - attach those to the window, if not - attach window by its url.

class Title
  def initialize(title)
    @@a = title
    $ie=Watir::IE.attach(:title, @@a) 
    rescue Watir::Exception::NoMatchingWindowFoundException
    puts ("could not find browser")
    r.addtoReport(testReport, "check page element", "FAILED", "Page title not found")
  end
end


if Title.new("Company")
else 
  $ie=Watir::IE.attach(:title,"http://")
end

Another variant is:

class Title
  def initialize(title,title1)
    @@a = title
    @@b=title1
    $ie=Watir::IE.attach(:title, @@a)  
    rescue Watir::Exception::NoMatchingWindowFoundException
    puts ("could not find browser")
    r.addtoReport(testReport, "check page element", "FAILED", "Page title not found")
    else
    $ie=Watir::IE.attach(:url, @@b)  
  end
end

Title.new("Company","http://")

Before attaching window:

$ie.button(:xpath, "//input[contains(@onclick, \"path\")]").click

Sorry for reviving an old post but this info must be somewhere. RE: It means watir is not founding the URL content. If you are pointing to localhost try running tests as administrator.