Weird Production Errors with Magic/XML

Hi,

I've been trying to use the Magic/XML library (http://chaosforge.org/
taw/magic_xml/) to parse some large XML files for my application.
Everything works fine on my Mac Mini that I'm developing on, but as
soon I try to deploy to production settings, I get this error:

XML is not a class
#{RAILS_ROOT}/lib/magic_xml.rb:374
#{RAILS_ROOT}/app/models/usb.rb:5
#{RAILS_ROOT}/app/views/dashboard/index.rhtml:11:in
`_run_rhtml_47app47views47dashboard47index46rhtml'

Anyone have any ideas as to what would be causing this or how to go
about troubleshooting?

Thanks for taking a look,
Tony