Problems with rexml

Ruby
1

I’m using this:
require ‘firewatir’
require “rexml/document”
include REXML

And I’m having problems when I’m requiring firewatir and REXML but not
if I require ‘watir’ instead of firewatir.

When I use rexml even if I’m not using firewatir (only requiring it) I’m
having this error:
NoMethodError: undefined method `each’ for nil:NilClass