NameError in Rails/infoController#properties ( uninitialized constant ActiveRecord::Base::SQLite3 )

I am trying to setup my RubyOnRails environment as mentioned in the
RailSpace book ( RailsSpace: Building a Social Networking Website with
Ruby on Rails ), pg 18. However when I click on the “About your
application’s environment” link, I get the following :

NameError in Rails/infoController#properties

uninitialized constant ActiveRecord::Base::SQLite3

sqlite3 is setup correctly, I am able to create my own database and
query it.

With Mongrel I get this stack trace :

Processing InfoController#properties (for 127.0.0.1 at 2008-08-01
14:41:02) [GET]
Session ID:
BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo
SGFzaHsABjoKQHVzZWR7AA==–41dd781d7835c4f0356f92927fa3dbfd6ae447a0
Parameters: {“action”=>“properties”, “controller”=>“rails/info”}

Processing InfoController#properties (for 127.0.0.1 at 2008-08-01
14:41:02) [GET]
Session ID:
BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo
SGFzaHsABjoKQHVzZWR7AA==–41dd781d7835c4f0356f92927fa3dbfd6ae447a0
Parameters: {“action”=>“properties”, “controller”=>“rails/info”}

NameError (uninitialized constant ActiveRecord::Base::SQLite3):
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/
active_support/dependencies.rb:492:in const_missing' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/ active_record/connection_adapters/sqlite3_adapter.rb:13:insqlite3_connection’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/
active_record/connection_adapters/abstract/connection_specification.rb:
292:in connection=' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/ active_record/connection_adapters/abstract/connection_specification.rb: 260:inretrieve_connection’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/
active_record/connection_adapters/abstract/connection_specification.rb:
78:in connection' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/ active_record/query_cache.rb:8:incache’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/caching/sql_cache.rb:12:in perform_action' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/ action_controller/base.rb:529:inprocess_without_filters’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/filters.rb:569:in
process_without_session_management_support' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/ action_controller/session_management.rb:130:inprocess’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/base.rb:389:in process' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/ action_controller/dispatcher.rb:149:inhandle_request’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/dispatcher.rb:107:in dispatch' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/ action_controller/dispatcher.rb:104:indispatch’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/dispatcher.rb:120:in dispatch_cgi' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/ action_controller/dispatcher.rb:35:indispatch’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/…/lib/mongrel/
rails.rb:76:in process' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/ rails.rb:74:inprocess’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:
159:in process_client' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 158:inprocess_client’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:
285:in run' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 285:inrun’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:
268:in run' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/ configurator.rb:282:inrun’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/
configurator.rb:281:in run' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 128:inrun’
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/
command.rb:212:in run' /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails: 281 /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/ active_support/dependencies.rb:502:inload’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/
active_support/dependencies.rb:354:in new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/ active_support/dependencies.rb:502:inload’
/usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/servers/
mongrel.rb:64
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/ active_support/dependencies.rb:509:inrequire’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/
active_support/dependencies.rb:354:in new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/ active_support/dependencies.rb:509:inrequire’
/usr/local/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/
server.rb:39
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require’
script/server:3

Rendering /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/
action_controller/templates/rescues/layout.erb (internal_server_error)

I am totally new to Ruby on Rails, so have no clue on what to fix.
From the above it appears that I don’t have the SQLite3 environment
setup correctly for Rails. Any idea on what I need to setup ?

Thanks.

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