Rails - Feb 2012 - Cannot start rails server: Please install the adapter: `gem install activerecord--adapter`

My app was working sublime ''till this morning when I noticed this
strange
error when running rails server:

$ rails s
=> Booting WEBrick
=> Rails 3.2.1 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`require'': Please install the adapter: `gem install
activerecord--adapter`
(cannot load such file -- active_record/connection_adapters/_adapter) 
(LoadError)
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`block in require''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:236:in
`load_dependency''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`require''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:48:in
`resolve_hash_connection''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:39:in
`resolve_string_connection''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:23:in
`spec''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:127:in
`establish_connection''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/railtie.rb:76:in
`block (2 levels) in <class:Railtie>''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/lazy_load_hooks.rb:36:in
`instance_eval''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/lazy_load_hooks.rb:36:in
`execute_hook''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/lazy_load_hooks.rb:26:in
`on_load''
from 
/usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/railtie.rb:74:in
`block in <class:Railtie>''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:30:in 
`instance_exec''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:30:in 
`run''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:55:in 
`block in run_initializers''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:54:in 
`each''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:54:in 
`run_initializers''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/application.rb:136:in 
`initialize!''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/railtie/configurable.rb:30:in
`method_missing''
from /home/al3xa/rails/sorcery/config/environment.rb:5:in `<top
(required)>''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`require''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`block in require''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:236:in
`load_dependency''
from 
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in
`require''
from /home/al3xa/rails/sorcery/config.ru:4:in `block in <main>''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in 
`instance_eval''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in 
`initialize''
from /home/al3xa/rails/sorcery/config.ru:1:in `new''
from /home/al3xa/rails/sorcery/config.ru:1:in `<main>''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in 
`eval''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in 
`parse_file''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in 
`app''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:46:in 
`app''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in 
`wrapped_app''
from /usr/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in 
`start''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:70:in 
`start''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:55:in 
`block in <top (required)>''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in 
`tap''
from 
/usr/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in 
`<top (required)>''
from script/rails:6:in `require''
from script/rails:6:in `<main>''

Note that I can''t replicate this bug in vanilla apps. I''m
using rubyRails
3.2.1 and ruby 1.9.3p0 (2011-10-30 revision 33570) [i686-linux]. FWIW, 
here''s my Gemfile too:

source ''https://rubygems.org''

gem ''rails'', ''3.2.1''

group :development, :test do
gem ''sqlite3''
gem ''annotate'', :git =>
''git://github.com/ctran/annotate_models.git''
gem ''rspec-rails''
end

group :assets do
gem ''sass-rails'', ''~> 3.2.3''
gem ''coffee-rails'', ''~> 3.2.1''
gem ''uglifier'', ''>= 1.0.3''
gem ''bootstrap-sass''
end

gem ''jquery-rails''

group :test do
gem ''capybara''
end

gem ''bcrypt-ruby'', ''~> 3.0.0''
gem ''sorcery''



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