hello everybody in the list!

For 2 days I have been trying to use acts_as_treemap plugin in my
project. It seemed to be really easy following rob's tutorial
(http://blog.tupleshop.com/2006/7/27/treemap-on-rails).
I have tried with a simple example, only 6 nodes, and I get this error:

stack level too deep

(eval):8:in `color'
(eval):8:in `color'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/ruby-treemap-0.0.2/lib/treemap/html_output.rb:61:in
`node_color'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/ruby-treemap-0.0.2/lib/treemap/html_output.rb:149:in
`draw_node'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/ruby-treemap-0.0.2/lib/treemap/html_output.rb:95:in
`draw_map'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/ruby-treemap-0.0.2/lib/treemap/html_output.rb:77:in
`to_html'
#{RAILS_ROOT}/vendor/plugins/acts_as_treemap/lib/treemap_helper.rb:30:in
`html_treemap'
#{RAILS_ROOT}/app/views/breed/index.rhtml:3:in
`_run_rhtml_47app47views47breed47index46rhtml'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_view/base.rb:326:in
`send'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_view/base.rb:326:in
`compile_and_render_template'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_view/base.rb:301:in
`render_template'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_view/base.rb:260:in
`render_file'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:806:in
`render_file'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:711:in
`render_with_no_layout'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/layout.rb:256:in
`render_without_benchmark'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:50:in
`render'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/1.8/benchmark.rb:293:in
`measure'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:50:in
`render'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:1096:in
`perform_action_without_filters'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:632:in
`call_filter'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:619:in
`perform_action_without_benchmark'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/1.8/benchmark.rb:293:in
`measure'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/rescue.rb:83:in
`perform_action'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:430:in
`send'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:430:in
`process_without_filters'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/filters.rb:624:in
`process_without_session_management_support'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session_management.rb:114:in
`process'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:330:in
`process'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in
`dispatch'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:78:in
`process'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:76:in
`synchronize'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/rails.rb:76:in
`process'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:618:in
`process_client'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:617:in
`each'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:617:in
`process_client'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in
`initialize'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in
`new'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:736:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in
`initialize'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in
`new'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel.rb:720:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:271:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:270:in
`each'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/configurator.rb:270:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/mongrel_rails:127:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/lib/mongrel/command.rb:211:in
`run'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/mongrel-1.0.1-mswin32/bin/mongrel_rails:243
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in
`load'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in
`load'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in
`new_constants_in'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:488:in
`load'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/mongrel.rb:60
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in
`require'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in
`new_constants_in'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in
`require'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
C:/instantrails/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
script/server:3

Any idea of what is happening?

Thanks!
-- 
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