Typo

While attempting to add anything to the sidebar it results in an Internal Server Error.

The Logs show the following:
SQL (0.000057) BEGIN
StaticSidebar Create (0.000176) INSERT INTO sidebars (config, staged_position, type, active_position, blog_id) VALUES('--- \ntitle: Links\nbody: \"\\n\\\n <ul>\\n <li><a href=\\\"http://www.typosphere.org\\\" title=\\\"Typo\\\">Typo</a></li>\\n <li><a href=\\\"http://blog.leetsoft.com\\\" title=\\\"too-biased\\\">too-biased</a></li>\\n <li><a href=\\\"http://blog.remor.com/\\\" title=\\\"seth hall\\\">Seth Hall</a></li>\\n <li><a href=\\\"http://scottstuff.net\\\" title=\\\"Scottstuff\\\">scottstuff.net</a></li>\\n <li><a href=\\\"http://www.bofh.org.uk\\\" title=\\\"Just a Summary\\\">Just A Summary</a></li>\\n <li><a href=\\\"http://nubyonrails.com\\\" title=\\\"Topfunky\\\">Topfunky</a></li>\\n <li><a href=\\\"http://planettypo.com\\\" title=\\\"PlanetTypo\\\">PlanetTypo</a></li>\\n <li><a href=\\\"http://typoforums.org\\\" title=\\\"Typo Forums\\\">Typo Forums</a></li>\\n <li><a href=\\\"http://fredericdevillamil.com\\\" title=\\\"Fr\\xC3\\xA9d\\xC3\\xA9ric de Villamil\\\">Fr\\xC3\\xA9d\\xC3\\xA9ric de Villamil</a></li>\\n\\\n </ul>\\n\"\n', NULL, 'StaticSidebar', NULL, 1)
Expiring #<StaticSidebar:0x2b127cbf5ef0>, with controller:
SQL (0.015964) ROLLBACK

ArgumentError (A copy of BlogSweeper has been removed from the module tree but is still active!):
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:237:in @load_missing_constant'
/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:469:in @const_missing'
/app/models/blog_sweeper.rb:64:in @sweep_articles'
/app/models/blog_sweeper.rb:45:in @expire_for'
/app/models/blog_sweeper.rb:27:in @after_save'
/vendor/rails/activerecord/lib/active_record/observer.rb:157:in @send'
/vendor/rails/activerecord/lib/active_record/observer.rb:157:in @update'
/usr/lib/ruby/1.8/observer.rb:185:in @notify_observers'
/usr/lib/ruby/1.8/observer.rb:184:in @each'
/usr/lib/ruby/1.8/observer.rb:184:in @notify_observers'
/vendor/rails/activerecord/lib/active_record/callbacks.rb:338:in @notify'
/vendor/rails/activerecord/lib/active_record/callbacks.rb:302:in @callback'
/vendor/rails/activerecord/lib/active_record/callbacks.rb:214:in @create_or_update'
/vendor/rails/activerecord/lib/active_record/base.rb:1978:in @save_without_validation!'
/vendor/rails/activerecord/lib/active_record/validations.rb:944:in @save_without_transactions!'
/vendor/rails/activerecord/lib/active_record/transactions.rb:112:in @save!'
/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:66:in @transaction'
/vendor/rails/activerecord/lib/active_record/transactions.rb:80:in @transaction'
/vendor/rails/activerecord/lib/active_record/transactions.rb:100:in @transaction'
/vendor/rails/activerecord/lib/active_record/transactions.rb:112:in @save!'
/vendor/rails/activerecord/lib/active_record/transactions.rb:120:in @rollback_active_record_state!'
/vendor/rails/activerecord/lib/active_record/transactions.rb:112:in @save!'
/vendor/rails/activerecord/lib/active_record/validations.rb:909:in @create!'
/app/controllers/admin/sidebar_controller.rb:27:in @set_active'
/vendor/rails/activerecord/lib/active_record/base.rb:1748:in @inject'
/app/controllers/admin/sidebar_controller.rb:25:in @each'
/app/controllers/admin/sidebar_controller.rb:25:in @inject'
/app/controllers/admin/sidebar_controller.rb:25:in @set_active'
/vendor/rails/actionpack/lib/action_controller/base.rb:1158:in @send'
/vendor/rails/actionpack/lib/action_controller/base.rb:1158:in @perform_action_without_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:697:in @call_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:725:in @run_before_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:664:in @call'
/vendor/rails/actionpack/lib/action_controller/filters.rb:664:in @proxy_before_and_after_filter'
/vendor/rails/actionpack/lib/action_controller/filters.rb:483:in @call'
/vendor/rails/actionpack/lib/action_controller/filters.rb:483:in @call'
/vendor/rails/actionpack/lib/action_controller/filters.rb:722:in @run_before_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:695:in @call_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:689:in @perform_action_without_benchmark'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in @perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in @measure'
/vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in @perform_action_without_rescue'
/vendor/rails/actionpack/lib/action_controller/rescue.rb:199:in @perform_action_without_caching'
/vendor/rails/actionpack/lib/action_controller/caching.rb:678:in @perform_action'
/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in @cache'
/vendor/rails/activerecord/lib/active_record/query_cache.rb:8:in @cache'
/vendor/rails/actionpack/lib/action_controller/caching.rb:677:in @perform_action'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in @send'
/vendor/rails/actionpack/lib/action_controller/base.rb:524:in @process_without_filters'
/vendor/rails/actionpack/lib/action_controller/filters.rb:685:in @process_without_session_management_support'
/vendor/rails/actionpack/lib/action_controller/session_management.rb:123:in @process'
/vendor/rails/actionpack/lib/action_controller/base.rb:388:in @process'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:171:in @handle_request'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:115:in @dispatch'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:126:in @dispatch_cgi'
/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:9:in @dispatch'
/vendor/rails/railties/lib/fcgi_handler.rb:101:in @process_request'
/vendor/rails/railties/lib/fcgi_handler.rb:149:in @with_signal_handler'
/vendor/rails/railties/lib/fcgi_handler.rb:99:in @process_request'
/vendor/rails/railties/lib/fcgi_handler.rb:77:in @process_each_request'
/usr/lib/ruby/1.8/fcgi.rb:612:in @each_cgi'
/usr/lib/ruby/1.8/fcgi.rb:609:in @each'
/usr/lib/ruby/1.8/fcgi.rb:609:in @each_cgi'
/vendor/rails/railties/lib/fcgi_handler.rb:76:in @process_each_request'
/vendor/rails/railties/lib/fcgi_handler.rb:50:in @process!'
/vendor/rails/railties/lib/fcgi_handler.rb:24:in @process!'
/public/dispatch.fcgi:24

Rendering /home/ashley/www/leymoo.com/vendor/rails/actionpack/lib/action_controller/templates/rescues/layout.erb (internal_server_error)