[Rails] error with WEBrick server

hii i decided to move from windows to linux (ubuntu 9.10) so i
installed ruby 1.8 rails 2.3.5 and sqlite 3
but when i lunch my WEBrick server it give me this error :
------------------------------------------------------------------
=>Booting WEBrick
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:271:in
`require_frameworks': no such file to load -- net/https (RuntimeError)
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:
134:in `process'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:
113:in `send'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:
113:in `run'
from /home/spyshow/Documents/rails_project/simple_app/config/
environment.rb:9
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb:156:in `require'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb:521:in `new_constants_in'
from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb:156:in `require'
from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:
84
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
from script/server:3
----------------------------------------------------------------------
so any idea what is going wrong ??
and how i can use (install) another server other than WEbrick ??