Rails - Jun 2008 - Rails 'rake gems:install' error in windows

I am developing with rails at three platform

mac, windows, linux.


until Rails 2.1, we can describe gem dependencies in environment.rb.

( this one ~
http://ryandaigle.com/articles/2008/4/1/what-s-new-in-edge-rails-gem-dependencies
)

so I write environment.rb like below  for using will_paginate

...
  config.gem ''capistrano''
  config.gem ''mislav-will_paginate'', :version =>
''~> 2.3.2'', :lib =>
''will_paginate'', :source =>
''http://gems.github.com''
...


after describing, in mac rails task is good result.

sudo rake gems:install
...





but Windows''s result is fail.

That is result.

C:\developments\eclipse\workspace_sdk\ZumpWeb>rake gems:install --trace
(in C:/developments/eclipse/workspace_sdk/ZumpWeb)
** Invoke gems:install (first_time)
** Invoke gems:base (first_time)
** Execute gems:base
** Invoke environment (first_time)
** Execute environment
rake aborted!
undefined method `collect'' for nil:NilClass
c:/bin/ruby/lib/ruby/site_ruby/1.8/rubygems/version.rb:237:in
`initialize''
c:/bin/ruby/lib/ruby/site_ruby/1.8/rubygems/version.rb:29:in `new''
c:/bin/ruby/lib/ruby/site_ruby/1.8/rubygems/version.rb:29:in
`initialize''
c:/bin/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/rails/gem_dependency.rb:104:in
`new''
c:/bin/ruby/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/rails
...


I run not yet in linux.


Does anybody have same experience?
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Sangmin Ryu wrote:
> but Windows''s result is fail.
> 
> That is result.
> undefined method `collect'' for nil:NilClass
I had the same problem and I discovered this blog post:

http://rails.lighthouseapp.com/projects/8994/tickets/462-loading-environment-fails-with-an-outdated-version-of-rubygems-while-using-config-gem-some_gem

Basically, I was running an old version of gem.  Do a "gem update 
--system"
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