After moving from Ruby 1.8.7 to 1.9.3 - test/unit/error (LoadError)

People,

For my old library app I did with Rails 2.1.1, if I use Fedora 16/Ruby 1.8.6, everything is OK. If I copy the app to a Fedora 17/Ruby 1.9.3 setup and reinstall all the old Gems and run:

   ./script/server

I get:

/usr/share/rubygems/rubygems/custom_require.rb:55:in `require': cannot load such file -- test/unit/error (LoadError)
from /usr/share/rubygems/rubygems/custom_require.rb:55:in `require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `block in require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:355:in `new_constants_in'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/deprecation.rb:204:in `<top (required)>'
from /usr/share/rubygems/rubygems/custom_require.rb:55:in `require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `block in require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:355:in `new_constants_in'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support/dependencies.rb:510:in `require'
from /usr/local/share/gems/gems/activesupport-2.1.1/lib/active_support.rb:40:in `<top (required)>'
from /usr/share/rubygems/rubygems/custom_require.rb:55:in `require'
from /usr/local/share/gems/gems/rails-2.1.1/lib/commands/server.rb:1:in `<top (required)>'
from /usr/share/rubygems/rubygems/custom_require.rb:55:in `require'
from ./script/server:3:in `<main>'

I have found similar problems reported and so have messed around with the paths in script/server:

#!/usr/bin/env ruby

# $: << File.dirname(__FILE__)
# $: << File.dirname(__FILE__) + '..'
# $: << File.dirname(__FILE__) + '../..'
# $: << File.join(File.dirname(__FILE__),'..')
# require File.dirname(__FILE__) + '/../config/boot'
# require File.expand_path('../../config/boot', __FILE__)
# require File.expand_path(__FILE__)+'/../../config/boot'

APP_PATH = File.expand_path('../../config/application', __FILE__)
require File.expand_path('../../config/boot', __FILE__)

# require 'rails/commands'
require 'commands/server'

Any suggestions? (besides writing the app from scratch in the new environment).

Thanks,

Phil.