app/models/line_item.rb:24:in `*'
app/models/line_item.rb:24:in `total_price'
app/views/carts/show.html.erb:7:in `block in 
_app_views_carts_show_html_erb___389431939__618846538'
activerecord (3.1.1) 
lib/active_record/associations/collection_proxy.rb:91:in `each'
activerecord (3.1.1) 
lib/active_record/associations/collection_proxy.rb:91:in 
`method_missing'
app/views/carts/show.html.erb:3:in 
`_app_views_carts_show_html_erb___389431939__618846538'
actionpack (3.1.1) lib/action_view/template.rb:144:in `block in render'
activesupport (3.1.1) lib/active_support/notifications.rb:55:in 
`instrument'
actionpack (3.1.1) lib/action_view/template.rb:142:in `render'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:40:in 
`block (2 levels) in render_template'
actionpack (3.1.1) lib/action_view/renderer/abstract_renderer.rb:33:in 
`block in instrument'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `block 
in instrument'
activesupport (3.1.1) 
lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in 
`instrument'
actionpack (3.1.1) lib/action_view/renderer/abstract_renderer.rb:33:in 
`instrument'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:39:in 
`block in render_template'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:47:in 
`render_with_layout'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:38:in 
`render_template'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:12:in 
`block in render'
actionpack (3.1.1) lib/action_view/renderer/abstract_renderer.rb:22:in 
`wrap_formats'
actionpack (3.1.1) lib/action_view/renderer/template_renderer.rb:9:in 
`render'
actionpack (3.1.1) lib/action_view/renderer/renderer.rb:36:in 
`render_template'
actionpack (3.1.1) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.1.1) lib/abstract_controller/rendering.rb:120:in 
`_render_template'
actionpack (3.1.1) lib/action_controller/metal/streaming.rb:250:in 
`_render_template'
actionpack (3.1.1) lib/abstract_controller/rendering.rb:114:in 
`render_to_body'
actionpack (3.1.1) lib/action_controller/metal/renderers.rb:30:in 
`render_to_body'
actionpack (3.1.1) lib/action_controller/metal/compatibility.rb:43:in 
`render_to_body'
actionpack (3.1.1) lib/abstract_controller/rendering.rb:99:in `render'
actionpack (3.1.1) lib/action_controller/metal/rendering.rb:16:in 
`render'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:40:in 
`block (2 levels) in render'
activesupport (3.1.1) lib/active_support/core_ext/benchmark.rb:5:in 
`block in ms'
/home/led/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/benchmark.rb:310:in 
`realtime'
activesupport (3.1.1) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:40:in 
`block in render'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:78:in 
`cleanup_view_runtime'
activerecord (3.1.1) 
lib/active_record/railties/controller_runtime.rb:24:in 
`cleanup_view_runtime'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:39:in 
`render'
actionpack (3.1.1) lib/action_controller/metal/implicit_render.rb:10:in 
`default_render'
actionpack (3.1.1) lib/action_controller/metal/mime_responds.rb:268:in 
`block in retrieve_response_from_mimes'
actionpack (3.1.1) lib/action_controller/metal/mime_responds.rb:195:in 
`call'
actionpack (3.1.1) lib/action_controller/metal/mime_responds.rb:195:in 
`respond_to'
app/controllers/carts_controller.rb:22:in `show'
actionpack (3.1.1) lib/action_controller/metal/implicit_render.rb:4:in 
`send_action'
actionpack (3.1.1) lib/abstract_controller/base.rb:167:in 
`process_action'
actionpack (3.1.1) lib/action_controller/metal/rendering.rb:10:in 
`process_action'
actionpack (3.1.1) lib/abstract_controller/callbacks.rb:18:in `block in 
process_action'
activesupport (3.1.1) lib/active_support/callbacks.rb:416:in 
`_run__371692982__process_action__266900328__callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:386:in 
`_run_process_action_callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in 
`run_callbacks'
actionpack (3.1.1) lib/abstract_controller/callbacks.rb:17:in 
`process_action'
actionpack (3.1.1) lib/action_controller/metal/rescue.rb:17:in 
`process_action'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:30:in 
`block in process_action'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `block 
in instrument'
activesupport (3.1.1) 
lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (3.1.1) lib/active_support/notifications.rb:53:in 
`instrument'
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:29:in 
`process_action'
actionpack (3.1.1) lib/action_controller/metal/params_wrapper.rb:201:in 
`process_action'
activerecord (3.1.1) 
lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.1.1) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.1.1) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.1.1) lib/action_controller/metal.rb:193:in `dispatch'
actionpack (3.1.1) lib/action_controller/metal/rack_delegation.rb:14:in 
`dispatch'
actionpack (3.1.1) lib/action_controller/metal.rb:236:in `block in 
action'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in `call'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in 
`dispatch'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:29:in `call'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:152:in `block in call'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `block in 
recognize'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in 
`optimized_each'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:95:in `recognize'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:141:in `call'
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:532:in 
`call'
actionpack (3.1.1) 
lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.3.6) lib/rack/etag.rb:23:in `call'
rack (1.3.6) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/params_parser.rb:21:in 
`call'
actionpack (3.1.1) lib/action_dispatch/middleware/flash.rb:243:in `call'
rack (1.3.6) lib/rack/session/abstract/id.rb:195:in `context'
rack (1.3.6) lib/rack/session/abstract/id.rb:190:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/cookies.rb:331:in 
`call'
activerecord (3.1.1) lib/active_record/query_cache.rb:62:in `call'
activerecord (3.1.1) 
lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in 
`call'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in 
`block in call'
activesupport (3.1.1) lib/active_support/callbacks.rb:392:in 
`_run_call_callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in 
`run_callbacks'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:28:in 
`call'
actionpack (3.1.1) lib/action_dispatch/middleware/reloader.rb:68:in 
`call'
rack (1.3.6) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/remote_ip.rb:48:in 
`call'
actionpack (3.1.1) 
lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.1) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.6) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.6) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.1) 
lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.6) lib/rack/lock.rb:15:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.1) lib/rails/engine.rb:456:in `call'
railties (3.1.1) lib/rails/rack/content_length.rb:16:in `call'
railties (3.1.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.6) lib/rack/handler/webrick.rb:59:in `service'
/home/led/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in
 
`service'
/home/led/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in
 
`run'
/home/led/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in 
`block in start_thread'


its the full trace of the error cant seems to find it im a week old in 
ruby on rails development

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