con l'altro comando ruby ./script/server il risultato è
/Users/simonacometti/.rvm/rubies/ruby-1.9.3-p547/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:121:in `require': iconv will be deprecated in the future, use String#encode instead.
=> Booting WEBrick
=> Rails 2.3.17 application starting on
http://0.0.0.0:3000/Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/rails-2.3.17/lib/rails/gem_dependency.rb:21:in `add_frozen_gem_path': undefined method `source_index' for Gem:Module (NoMethodError)
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/rails-2.3.17/lib/initializer.rb:298:in `add_gem_load_paths'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/rails-2.3.17/lib/initializer.rb:132:in `process'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/rails-2.3.17/lib/initializer.rb:113:in `run'
from /Users/simonacometti/temp/archimista/config/environment.rb:23:in `<top (required)>'
from /Users/simonacometti/.rvm/rubies/ruby-1.9.3-p547/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:121:in `require'
from /Users/simonacometti/.rvm/rubies/ruby-1.9.3-p547/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:121:in `require'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/activesupport-2.3.17/lib/active_support/dependencies.rb:182:in `block in require'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/activesupport-2.3.17/lib/active_support/dependencies.rb:547:in `new_constants_in'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/activesupport-2.3.17/lib/active_support/dependencies.rb:182:in `require'
from /Users/simonacometti/.rvm/gems/ruby-1.9.3-p547/gems/rails-2.3.17/lib/commands/server.rb:84:in `<top (required)>'
from /Users/simonacometti/.rvm/rubies/ruby-1.9.3-p547/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:69:in `require'
from /Users/simonacometti/.rvm/rubies/ruby-1.9.3-p547/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:69:in `require'
from ./script/server:3:in `<main>'