Publishing Rails with SwitchTower

I need a simpler way to get my changes out to the web site. currently I am just copying file by file to FTP but this is tedious and error prone. I have heard that Switch Tower is the tool of choice for deploying Rails apps so here goes:

gem install switchtower

The install seemed to go well with the following dependencies also being installed.

Attempting local installation of 'switchtower'
Local gem file not found: switchtower*.gem
Attempting remote installation of 'switchtower'
Updating Gem source index for: http://gems.rubyforge.org
Install required dependency net-ssh? [Yn] y
Install required dependency needle? [Yn] y
Install required dependency net-sftp? [Yn] y
Successfully installed switchtower, version 1.0.1

Switch Tower needs to make some changes to the current rails app so that it can deploy it.

switchtower --apply-to [full path to rails app]

This seems easy enough but the first run gives me this. After a hour of google searching and drilling down into the gem install I find that the error, is infact, correct, the rails_generator/sripts/generate code does not exist as part if the switchtower install but I don't know where to get it so I am stuck.

in `require__': No such file to load -- rails_generator/scripts/generate (Missin
from d:/products/ruby-1.8.2-14/lib/ruby/site_ruby/1.8/rubygems/loadpath_
manager.rb:5:in `require'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/activesupport-1.2.
5/lib/active_support/dependencies.rb:214:in `require'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/switchtower-1.0.1/
lib/switchtower/generators/rails/loader.rb:7:in `load!'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/switchtower-1.0.1/
lib/switchtower/cli.rb:248:in `execute_apply_to!'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/switchtower-1.0.1/
lib/switchtower/cli.rb:219:in `execute!'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/switchtower-1.0.1/
lib/switchtower/cli.rb:12:in `execute!'
from d:/products/ruby-1.8.2-14/lib/ruby/gems/1.8/gems/switchtower-1.0.1/
from d:/products/ruby-1.8.2-14/bin/switchtower:19:in `load'
from d:/products/ruby-1.8.2-14/bin/switchtower:19

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