Eu estou no processo de atualizar um aplicativo do Rails 3.2 para o Rails 4.1. Sempre que eu tento iniciar o console ou servidor, me deparo com esse erro:

C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.1.0.beta1/lib/active_support
/core_ext/time/zones.rb:70:in `rescue in find_zone!': uninitialized constant TZI
nfo::InvalidTimezoneIdentifier (NameError)
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.1.0.beta1/lib/a
ctive_support/core_ext/time/zones.rb:55:in `find_zone!'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.1.0.beta1/lib/a
ctive_support/railtie.rb:20:in `block in <class:Railtie>'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
initializable.rb:30:in `instance_exec'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
initializable.rb:30:in `run'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
initializable.rb:55:in `block in run_initializers'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each
_strongly_connected_component'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_
component_from'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_c
onnected_component'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:180:in `each'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_
component'
        from C:/Ruby200/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
initializable.rb:54:in `run_initializers'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
application.rb:285:in `initialize!'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
railtie.rb:194:in `public_send'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.1.0.beta1/lib/rails/
railtie.rb:194:in `method_missing'
        from C:/sites/RailsApp/config/environment.rb:5:in `<top (required)>'
        ...

Não tenho certeza do que está causando isso e me perguntei se alguém tem algum conselho. Eu tentei isso no irb e não encontrei nenhum problema (um erro é levantado como deveria ser):

irb(main):001:0> require 'active_support/core_ext/time/zones'
=> true
irb(main):002:0> Time.find_zone!('good')
ArgumentError: Invalid Timezone: f
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.1.0.beta1/lib/a
ctive_support/core_ext/time/zones.rb:71:in `rescue in find_zone!'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.1.0.beta1/lib/a
ctive_support/core_ext/time/zones.rb:55:in `find_zone!'
        from (irb):3
        from C:/Ruby200/bin/irb:12:in `<main>'

Gemfile inclui:

ruby "2.0.0"
gem "rails", "~> 4.1.0.beta1"
gem 'tzinfo-data'

Editar (mais algumas informações): Parece que a inclusão da gem 'tzinfo-data' pode estar bagunçando alguma coisa? Quando a gema está no gemfile, parece que o 'tzinfo' nunca é necessário durante oRailsApp::Application.initialize! chame em environment.rb. No entanto, quando a gema é removida, o requerimento está acontecendo.