Ruby on Rails

I have installed Ruby 1.8.7 and rails 3.0.3 on ubuntu 10.04.
i am following the steps given in the book 'Agile web development with rails' and i am new to the world of ruby on rails.

just after entire installation i have created a rails application called 'demo'

however when i enter the command ........ruby script/server     i get the following error:
Could not find gem 'sqlite3-ruby (>= 0, runtime)' in any of the gem sources listed in your Gemfile.
Try running `bundle install`.


I have already installed mysql database.


Thanks,
Chinmaya Joshi

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