i had ruby 1.8.7 in my system.(Ubuntu 9.04)
Rails version is 2.1.0
now i have installed ruby 1.9.1p129 side by side with 1.8.7

$ ruby -v
ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]

nd i,ve also done the following:
$ sudo gem install rails

now
$ gem list


*** LOCAL GEMS ***

actionmailer (2.3.3)
actionpack (2.3.3)
activerecord (2.3.3)
activeresource (2.3.3)
activesupport (2.3.3)
rack (1.0.0)
rails (2.3.3)
rake (0.8.7)

now i'm not able to start server for the application which i had
developed using ruby 1.8.7 ..i.e.
now when i do 'ruby script/server'

following error comes:-
/home/abhi/Rails_Projects/Blog/vendor/rails/activesupport/lib/active_support/vendor.rb:33:in
`require': no such file to load -- builder (LoadError)
from
/home/abhi/Rails_Projects/Blog/vendor/rails/activesupport/lib/active_support/vendor.rb:33:in
`rescue in <top (required)>'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/activesupport/lib/active_support/vendor.rb:2:in
`<top (required)>'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/activesupport/lib/active_support.rb:26:in
`require'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/activesupport/lib/active_support.rb:26:in
`<top (required)>'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/commands/server.rb:1:in
`require'

and on doing
$ ruby script/console
i got:

Loading development environment (Rails 2.1.0)
/opt/ruby1.9/lib/ruby1.9/1.9.1/irb/completion.rb:9:in
`require':LoadError: no such file to load -- readline
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/initializer.rb:225:in
`rescue in require_frameworks': no such file to load -- builder
(RuntimeError)
from
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/initializer.rb:222:in
`require_frameworks'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/initializer.rb:113:in
`process'
from
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/initializer.rb:93:in
`run'
from /home/abhi/Rails_Projects/Blog/config/environment.rb:13:in `<top
(required)>'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb/init.rb:262:in `require'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb/init.rb:262:in `block in
load_modules'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb/init.rb:260:in `each'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb/init.rb:260:in `load_modules'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb/init.rb:20:in `setup'
from /opt/ruby1.9/lib/ruby1.9/1.9.1/irb.rb:53:in `start'
from /usr/local/bin/irb:12:in `<main>'

from
/home/abhi/Rails_Projects/Blog/vendor/rails/railties/lib/commands/server.rb:1:in
`<top (required)>'
from script/server:3:in `require'
from script/server:3:in `<main>'
-- 
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