This isn't very helpful. Which file is to blame? It's not my work that's causing it.

Rails 3 i18n deperecation warning

The {{key}} interpolation syntax in I18n messages is deprecated. Please use %{key} instead.
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:162:in `interpolate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:157:in `gsub'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:157:in `interpolate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:197:in `preserve_encoding'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:156:in `interpolate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:49:in `translate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n.rb:152:in `translate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:120:in `resolve'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:105:in `default'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:104:in `each'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:104:in `default'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n/backend/base.rb:42:in `translate'
/Library/Ruby/Gems/1.8/gems/i18n-0.4.1/lib/i18n.rb:152:in `t'
/Library/Ruby/Gems/1.8/gems/responders-0.6.0/lib/responders/flash_responder.rb:115:in `set_flash_message!'
/Library/Ruby/Gems/1.8/gems/responders-0.6.0/lib/responders/flash_responder.rb:92:in `to_html'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/responder.rb:119:in `send'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/responder.rb:119:in `respond'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/responder.rb:112:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/mime_responds.rb:232:in `respond_with'
/Library/Ruby/Gems/1.8/gems/inherited_resources-1.1.2/lib/inherited_resources/base_helpers.rb:250:in `respond_with_dual_blocks'
/Library/Ruby/Gems/1.8/gems/inherited_resources-1.1.2/lib/inherited_resources/actions.rb:37:in `create'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/abstract_controller/base.rb:150:in `process_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/rendering.rb:11:in `process_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/abstract_controller/callbacks.rb:18:in `process_action'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:450:in `_run__1931842585__process_action__1623385099__callbacks'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:409:in `send'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:409:in `_run_process_action_callbacks'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:93:in `send'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:93:in `run_callbacks'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/abstract_controller/callbacks.rb:17:in `process_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/notifications.rb:52:in `instrument'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/notifications.rb:52:in `instrument'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/rescue.rb:17:in `process_action'
/Library/Ruby/Gems/1.8/gems/cucumber-rails-0.3.2/lib/cucumber/rails/action_controller.rb:13:in `process_action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/abstract_controller/base.rb:119:in `process'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/abstract_controller/rendering.rb:40:in `process'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal.rb:133:in `dispatch'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_controller/metal.rb:173:in `action'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/routing/route_set.rb:62:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/routing/route_set.rb:62:in `dispatch'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/routing/route_set.rb:27:in `call'
/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.13/lib/rack/mount/route_set.rb:148:in `call'
/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.13/lib/rack/mount/code_generation.rb:93:in `recognize'
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/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.13/lib/rack/mount/code_generation.rb:92:in `recognize'
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/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/routing/route_set.rb:492:in `call'
/Library/Ruby/Gems/1.8/gems/haml-3.0.18/lib/sass/plugin/rack.rb:41:in `call'
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/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/methodoverride.rb:24:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/flash.rb:182:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/cookies.rb:287:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/query_cache.rb:32:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
/Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/query_cache.rb:12:in `cache'
/Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/query_cache.rb:31:in `call'
/Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/callbacks.rb:46:in `call'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:415:in `_run_call_callbacks'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/callbacks.rb:44:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/sendfile.rb:107:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
/Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/rack/logger.rb:13:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/runtime.rb:17:in `call'
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.0/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/lock.rb:11:in `synchronize'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/static.rb:30:in `call'
/Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/application.rb:168:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/urlmap.rb:47:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/urlmap.rb:41:in `each'
/Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/urlmap.rb:41:in `call'
/Library/Ruby/Gems/1.8/gems/rack-test-0.5.4/lib/rack/mock_session.rb:30:in `request'
/Library/Ruby/Gems/1.8/gems/rack-test-0.5.4/lib/rack/test.rb:207:in `process_request'
/Library/Ruby/Gems/1.8/gems/rack-test-0.5.4/lib/rack/test.rb:66:in `post'
(__FORWARDABLE__):3:in `__send__'
(__FORWARDABLE__):3:in `post'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/driver/rack_test_driver.rb:242:in `post'
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/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/driver/rack_test_driver.rb:220:in `submit'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/driver/rack_test_driver.rb:153:in `submit'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/driver/rack_test_driver.rb:76:in `click_without_javascript_emulation'
/Library/Ruby/Gems/1.8/gems/cucumber-rails-0.3.2/lib/cucumber/rails/capybara_javascript_emulation.rb:15:in `click'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/node.rb:144:in `click'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/node/actions.rb:37:in `click_button'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/session.rb:273:in `send'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/session.rb:273:in `method_missing'
/Library/Ruby/Gems/1.8/gems/capybara-0.4.0.rc/lib/capybara/dsl.rb:93:in `click_button'
/Users/chad/Dropbox/Sites/pc/features/step_definitions/web_steps.rb:29
/Users/chad/Dropbox/Sites/pc/features/step_definitions/web_steps.rb:14:in `with_scope'
/Users/chad/Dropbox/Sites/pc/features/step_definitions/web_steps.rb:28
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/core_ext/instance_exec.rb:48:in `instance_exec'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/core_ext/instance_exec.rb:48:in `cucumber_instance_exec'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/core_ext/instance_exec.rb:69:in `cucumber_run_with_backtrace_filtering'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/core_ext/instance_exec.rb:36:in `cucumber_instance_exec'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/rb_support/rb_step_definition.rb:62:in `invoke'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/step_match.rb:26:in `invoke'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/step_invocation.rb:63:in `invoke'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/step_invocation.rb:42:in `accept'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:99:in `visit_step'
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/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/step_collection.rb:14:in `accept'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:93:in `visit_steps'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:164:in `broadcast'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:92:in `visit_steps'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/scenario.rb:53:in `accept'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/runtime.rb:77:in `with_hooks'
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/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/feature.rb:35:in `accept'
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/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:19:in `visit_feature'
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/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:164:in `broadcast'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/ast/tree_walker.rb:13:in `visit_features'
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/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/../lib/cucumber/cli/main.rb:21:in `execute'
/Library/Ruby/Gems/1.8/gems/cucumber-0.9.3/bin/cucumber:8