Nuovo in ruby, qualcuno può aiutarmi a decifrare questo errore dalla console?

Non sono proprio sicuro di cosa significhi o cosa dovrei fare per far funzionare la pagina web sul mio localhost. In questo momento sta solo mostrando un errore che dice "Siamo spiacenti, ma qualcosa è andato storto." quando eseguo rails server e apro localhost:3000 in chrome.Nuovo in ruby, qualcuno può aiutarmi a decifrare questo errore dalla console?

Ecco l'output della console:

Started GET "https://stackoverflow.com/users/sign_in" for 127.0.0.1 at 2013-07-05 12:07:07 -0400 
Processing by Devise::SessionsController#new as HTML 
Completed 500 Internal Server Error in 55ms 

NoMethodError (undefined method `empty?' for nil:NilClass): 
    actionpack (3.2.11) lib/action_view/lookup_context.rb:145:in `detail_args_for' 
    actionpack (3.2.11) lib/action_view/lookup_context.rb:139:in `args_for_lookup' 
    actionpack (3.2.11) lib/action_view/lookup_context.rb:109:in `find' 
    actionpack (3.2.11) lib/action_view/renderer/abstract_renderer.rb:3:in `find_template' 
    actionpack (3.2.11) lib/action_view/renderer/template_renderer.rb:34:in `determine_template' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:153:in `render_with_newrelic' 
    actionpack (3.2.11) lib/action_view/renderer/renderer.rb:36:in `render_template' 
    actionpack (3.2.11) lib/action_view/renderer/renderer.rb:17:in `render' 
    actionpack (3.2.11) lib/abstract_controller/rendering.rb:110:in `_render_template' 
    actionpack (3.2.11) lib/action_controller/metal/streaming.rb:225:in `_render_template' 
    actionpack (3.2.11) lib/abstract_controller/rendering.rb:103:in `render_to_body' 
    actionpack (3.2.11) lib/action_controller/metal/renderers.rb:28:in `render_to_body' 
    actionpack (3.2.11) lib/action_controller/metal/compatibility.rb:50:in `render_to_body' 
    actionpack (3.2.11) lib/abstract_controller/rendering.rb:88:in `render' 
    actionpack (3.2.11) lib/action_controller/metal/rendering.rb:16:in `render' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' 
    activesupport (3.2.11) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' 
    /Users/Alex/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in `realtime' 
    activesupport (3.2.11) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:40:in `block in render' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' 
    activerecord (3.2.11) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:39:in `render' 
    remotipart (1.0.5) lib/remotipart/render_overrides.rb:14:in `render_with_remotipart' 
    actionpack (3.2.11) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
    actionpack (3.2.11) lib/action_controller/metal/responder.rb:232:in `default_render' 
    actionpack (3.2.11) lib/action_controller/metal/responder.rb:160:in `to_html' 
    actionpack (3.2.11) lib/action_controller/metal/responder.rb:153:in `respond' 
    actionpack (3.2.11) lib/action_controller/metal/responder.rb:146:in `call' 
    actionpack (3.2.11) lib/action_controller/metal/mime_responds.rb:239:in `respond_with' 
    devise (2.2.3) app/controllers/devise/sessions_controller.rb:10:in `new' 
    actionpack (3.2.11) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
    actionpack (3.2.11) lib/abstract_controller/base.rb:167:in `process_action' 
    actionpack (3.2.11) lib/action_controller/metal/rendering.rb:10:in `process_action' 
    actionpack (3.2.11) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:447:in `_run__4160102059982529417__process_action__1687296135628327387__callbacks' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.11) lib/abstract_controller/callbacks.rb:17:in `process_action' 
    actionpack (3.2.11) lib/action_controller/metal/rescue.rb:29:in `process_action' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    activesupport (3.2.11) lib/active_support/notifications.rb:123:in `block in instrument' 
    activesupport (3.2.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    activesupport (3.2.11) lib/active_support/notifications.rb:123:in `instrument' 
    actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    actionpack (3.2.11) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
    activerecord (3.2.11) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:268:in `block in perform_action_with_newrelic_trace' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/method_tracer.rb:240:in `trace_execution_scoped' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:263:in `perform_action_with_newrelic_trace' 
    newrelic_rpm (3.5.5.38) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action' 
    actionpack (3.2.11) lib/abstract_controller/base.rb:121:in `process' 
    actionpack (3.2.11) lib/abstract_controller/rendering.rb:45:in `process' 
    actionpack (3.2.11) lib/action_controller/metal.rb:203:in `dispatch' 
    actionpack (3.2.11) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
    actionpack (3.2.11) lib/action_controller/metal.rb:246:in `block in action' 
    actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `call' 
    actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
    actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:36:in `call' 
    actionpack (3.2.11) lib/action_dispatch/routing/mapper.rb:42:in `call' 
    journey (1.0.4) lib/journey/router.rb:68:in `block in call' 
    journey (1.0.4) lib/journey/router.rb:56:in `each' 
    journey (1.0.4) lib/journey/router.rb:56:in `call' 
    actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:601:in `call' 
    rack-pjax (0.7.0) lib/rack/pjax.rb:12:in `call' 
    newrelic_rpm (3.5.5.38) lib/new_relic/rack/error_collector.rb:8:in `call' 
    newrelic_rpm (3.5.5.38) lib/new_relic/rack/browser_monitoring.rb:12:in `call' 
    newrelic_rpm (3.5.5.38) lib/new_relic/rack/developer_mode.rb:24:in `call' 
    warden (1.2.1) lib/warden/manager.rb:35:in `block in call' 
    warden (1.2.1) lib/warden/manager.rb:34:in `catch' 
    warden (1.2.1) lib/warden/manager.rb:34:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
    rack (1.4.5) lib/rack/etag.rb:23:in `call' 
    rack (1.4.5) lib/rack/conditionalget.rb:25:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/head.rb:14:in `call' 
    remotipart (1.0.5) lib/remotipart/middleware.rb:30:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/flash.rb:242:in `call' 
    rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context' 
    rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/cookies.rb:341:in `call' 
    activerecord (3.2.11) lib/active_record/query_cache.rb:64:in `call' 
    activerecord (3.2.11) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `_run__1343605869620971269__call__1397566206717956287__callbacks' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
    activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
    railties (3.2.11) lib/rails/rack/logger.rb:32:in `call_app' 
    railties (3.2.11) lib/rails/rack/logger.rb:16:in `block in call' 
    activesupport (3.2.11) lib/active_support/tagged_logging.rb:22:in `tagged' 
    railties (3.2.11) lib/rails/rack/logger.rb:16:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
    rack (1.4.5) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.4.5) lib/rack/runtime.rb:17:in `call' 
    activesupport (3.2.11) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
    rack (1.4.5) lib/rack/lock.rb:15:in `call' 
    actionpack (3.2.11) lib/action_dispatch/middleware/static.rb:62:in `call' 
    railties (3.2.11) lib/rails/engine.rb:479:in `call' 
    railties (3.2.11) lib/rails/application.rb:223:in `call' 
    rack (1.4.5) lib/rack/content_length.rb:14:in `call' 
    railties (3.2.11) lib/rails/rack/log_tailer.rb:17:in `call' 
    rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' 
    /Users/Alex/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service' 
    /Users/Alex/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run' 
    /Users/Alex/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'

fonte

2013-07-05 Alex S

utilizzare "vuoto?" invece di "vuoto?" –

Le altre risposte sono corrette in generale. Questa eccezione, in particolare, è causata da un'incompatibilità tra versioni precedenti della gemma newrelic_rpm e Ruby 2.0. Vedi rails #8885.

Aggiorna la gemma newrelic_rpm e dovrebbe andare via.

fonte

2013-11-26 17:09:46

È un'eccezione riferimento null nel metodo detail_args_for (ben tecnicamente un'eccezione riferimento zero). Stai cercando di chiamare il metodo empty? su una variabile con valore Nil, che causa un problema perché non è definito in nil

fonte

2013-07-05 16:13:13 konkked

Non esiste una "eccezione di riferimento null" in Ruby. Ruby non è Java. –

Stai chiamando .empty? su una variabile che non è stata inizializzata da qualche parte nel tuo Metodo detail_args_for. E 'probabilmente per aggiungere un ulteriore invito a .nil? prima di controllare .empty? se si desidera consentire valori Nil:

if(!someVar.nil? && someVar.empty?)

fonte

2013-07-05 16:14:04

Nuovo in ruby, qualcuno può aiutarmi a decifrare questo errore dalla console?

risposta

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