Rails - Nov 2010 - RAILS3 new validation class not working

I am using the new validation class rails3 provides.  The issue is it
keeps giving me an error in the whole app of:

:attributes cannot be blank

here is the class below.  I commented out all of the code to do
anything but it still gives me the error.   Ideas??

class FileUploadValidator < ActiveModel::EachValidator

  def validate_each(record, attribute, value)

  end

end

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