Error in rails at startup

Hi everybody.
I met a strange situation when I begin to use rails.
I install the ruby 1.86, rails 2.0.2, and update the gem to 1.0.1
then I install mongrel.
Just create the rails project and type
"ruby script/generate controller Greeting"
then edit the file greeting_controller.rb add several lines
   def index
      render :text => "<h1>Welcome to your first Rails application<h1>"
   end

Now I get in this url. It says
MissingSourceFile (no such file to load -- sqlite3):
E:/Program
Files/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
E:/Program
Files/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
E:/Program Files/Ruby/lib/ruby/gems/1.8/gems/activesupport-
      2.0.2/lib/active_support/dependencies.rb:496:in `require'

and so on.
Who can tell me how to fix it .Thanks

your rails database.yml is configured to use sqlite3,
most likely you installed mysql (or not, or nothing)

in config/database.yml
this:

development:
  adapter: mysql
  encoding: utf8
  database: myapp_dev
  username: root
  password:
test:
  adapter: mysql
  encoding: utf8
  database: myapp_tesst
  username: root
  password:
production:
  adapter: mysql
  encoding: utf8
  database: myapp_prod
  username:
  password:

would be correct for mysql

OMG, it works!
I am so appreciative of this and can't hold myself!

http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=no+such+file+to+load+sqlite3
http://groups.google.com/group/rubyonrails-talk/search?group=rubyonrails-talk&q=no+such+file+to+load+sqlite3&qt_g=Search+this+group

Install sqlite3.