I wanted to migrate my project from rails 2.1.0 to rails 2.3.3
so, i performed following steps, but it shows me memcached-client error.

vi config/environment.rb

# Specifies gem version of Rails to use when vendor/rails is not present
RAILS_GEM_VERSION = '2.3.3' unless defined? RAILS_GEM_VERSION

ruby script/server

It shows me error
`install_memcached': 'memcache-client' client requested but not installed. Try 'sudo gem install memcache-client'. (Interlock::ConfigurationError)

so, i installed memcache-client gem

gem install memcache-client

but still i am showing same error, any ideas ??