[Rails] launch error

Hey all, I am just getting started with RoR and am having trouble
launching the localhost:3000 page. Here is the error message I am
getting in my command prompt:

<code>C:\Users\Michael\rubydev\ch04\first>ruby script/server
C:/Ruby19/lib/ruby/site_ruby/1.9.1/rubygems.rb:827:in
`report_activate_error': R
ubyGem version error: rack(1.0.0 not ~> 1.0.1) (Gem::LoadError)
from C:/Ruby19/lib/ruby/site_ruby/1.9.1/rubygems.rb:261:in
`activate'
from C:/Ruby19/lib/ruby/site_ruby/1.9.1/rubygems.rb:68:in `gem'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/actionpack-2.3.5/lib/action_cont
roller.rb:34:in `<top (required)>'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/activesupport-2.3.5/lib/active_s
upport/dependencies.rb:156:in `require'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/activesupport-2.3.5/lib/active_s
upport/dependencies.rb:156:in `block in require'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/activesupport-2.3.5/lib/active_s
upport/dependencies.rb:521:in `new_constants_in'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/activesupport-2.3.5/lib/active_s
upport/dependencies.rb:156:in `require'
from
C:/Ruby19/lib/ruby/gems/1.9.1/gems/rails-2.3.5/lib/commands/server.
rb:2:in `<top (required)>'
from script/server:3:in `require'
from script/server:3:in `<main>' </code>

I am not sure how to fix this, any advice would be great! thank you in
advance!
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