NoMethodError PostsController#new

[ShiningRay]

Error message
/groups/pool/topics/396644/posts/new
NoMethodError: undefined method id' for nil:NilClass Sample stack trace (hide Rails) …ses/20150718130745/app/controllers/ posts_controller.rb: 198:innew'
…k-4.2.3/lib/action_controller/metal/
implicit_render.rb: 4:in send_action' …/gems/actionpack-4.2.3/lib/abstract_controller/ base.rb: 198:inprocess_action'
…ionpack-4.2.3/lib/action_controller/metal/
rendering.rb: 10:in process_action' …/actionpack-4.2.3/lib/abstract_controller/ callbacks.rb: 20:inblock in process_action'
…ms/activesupport-4.2.3/lib/active_support/
callbacks.rb: 115:in call' …ms/activesupport-4.2.3/lib/active_support/ callbacks.rb: 115:incall'
…ms/activesupport-4.2.3/lib/active_support/
callbacks.rb: 553:in block (2 levels) in compile' …ms/activesupport-4.2.3/lib/active_support/ callbacks.rb: 503:incall'
…ms/activesupport-4.2.3/lib/active_support/
callbacks.rb: 503:in call' …ms/activesupport-4.2.3/lib/active_support/ callbacks.rb: 88:inrun_callbacks'
…/actionpack-4.2.3/lib/abstract_controller/
callbacks.rb: 19:in process_action' …actionpack-4.2.3/lib/action_controller/metal/ rescue.rb: 29:inprocess_action'
…k-4.2.3/lib/action_controller/metal/
instrumentation.rb: 32:in block in process_action' …ctivesupport-4.2.3/lib/active_support/ notifications.rb: 164:inblock in instrument'
…4.2.3/lib/active_support/notifications/
instrumenter.rb: 20:in instrument' …ctivesupport-4.2.3/lib/active_support/ notifications.rb: 164:ininstrument'
…k-4.2.3/lib/action_controller/metal/
instrumentation.rb: 30:in process_action' …ck-4.2.3/lib/action_controller/metal/ params_wrapper.rb: 250:inprocess_action'
…4.2.3/lib/active_record/railties/
controller_runtime.rb: 18:in process_action' …/gems/actionpack-4.2.3/lib/abstract_controller/ base.rb: 137:inprocess'
…2.0/gems/actionview-4.2.3/lib/action_view/
rendering.rb: 30:in process' …0/gems/actionpack-4.2.3/lib/action_controller/ metal.rb: 196:indispatch'
…k-4.2.3/lib/action_controller/metal/
rack_delegation.rb: 13:in dispatch' …0/gems/actionpack-4.2.3/lib/action_controller/ metal.rb: 237:inblock in action'
…ionpack-4.2.3/lib/action_dispatch/routing/
route_set.rb: 76:in call' …ionpack-4.2.3/lib/action_dispatch/routing/ route_set.rb: 76:indispatch'
…ionpack-4.2.3/lib/action_dispatch/routing/
route_set.rb: 45:in serve' …actionpack-4.2.3/lib/action_dispatch/journey/ router.rb: 43:inblock in serve'
…actionpack-4.2.3/lib/action_dispatch/journey/
router.rb: 30:in each' …actionpack-4.2.3/lib/action_dispatch/journey/ router.rb: 30:inserve'
…ionpack-4.2.3/lib/action_dispatch/routing/
route_set.rb: 821:in call' ….2.0/gems/rack-raw-upload-1.1.1/lib/rack/ raw_upload.rb: 18:incall'
…simple_captcha2-0.3.4/lib/simple_captcha/
middleware.rb: 26:in call' …red/bundle/ruby/2.2.0/gems/rack-1.6.4/lib/rack/ etag.rb: 24:incall'
…/ruby/2.2.0/gems/rack-1.6.4/lib/rack/
conditionalget.rb: 25:in call' …red/bundle/ruby/2.2.0/gems/rack-1.6.4/lib/rack/ head.rb: 13:incall'
…2.0/gems/remotipart-1.2.1/lib/remotipart/
middleware.rb: 27:in call' …-4.2.3/lib/action_dispatch/middleware/ params_parser.rb: 27:incall'
…tionpack-4.2.3/lib/action_dispatch/middleware/
flash.rb: 260:in call' …/2.2.0/gems/rack-1.6.4/lib/rack/session/abstract/ id.rb: 225:incontext'
…/2.2.0/gems/rack-1.6.4/lib/rack/session/abstract/
id.rb: 220:in call' …onpack-4.2.3/lib/action_dispatch/middleware/ cookies.rb: 560:incall'
…ms/activerecord-4.2.3/lib/active_record/
query_cache.rb: 36:in call' …record/connection_adapters/abstract/ connection_pool.rb: 653:incall'
…pack-4.2.3/lib/action_dispatch/middleware/
callbacks.rb: 29:in block in call' …ms/activesupport-4.2.3/lib/active_support/ callbacks.rb: 84:inrun_callbacks'
…pack-4.2.3/lib/action_dispatch/middleware/
callbacks.rb: 27:in call' …pack-4.2.3/lib/action_dispatch/middleware/ remote_ip.rb: 78:incall'
…2.3/lib/action_dispatch/middleware/
debug_exceptions.rb: 17:in call' ….2.3/lib/action_dispatch/middleware/ show_exceptions.rb: 30:incall'
…uby/2.2.0/gems/railties-4.2.3/lib/rails/rack/
logger.rb: 38:in call_app' …uby/2.2.0/gems/railties-4.2.3/lib/rails/rack/ logger.rb: 20:inblock in call'
…tivesupport-4.2.3/lib/active_support/
tagged_logging.rb: 68:in block in tagged' …tivesupport-4.2.3/lib/active_support/ tagged_logging.rb: 26:intagged'
…tivesupport-4.2.3/lib/active_support/
tagged_logging.rb: 68:in tagged' …uby/2.2.0/gems/railties-4.2.3/lib/rails/rack/ logger.rb: 20:incall'
…ms/request_store-1.1.0/lib/request_store/
middleware.rb: 8:in call' …ack-4.2.3/lib/action_dispatch/middleware/ request_id.rb: 21:incall'
…/ruby/2.2.0/gems/rack-1.6.4/lib/rack/
methodoverride.rb: 22:in call' …/bundle/ruby/2.2.0/gems/rack-1.6.4/lib/rack/ runtime.rb: 18:incall'
…ctive_support/cache/strategy/
local_cache_middleware.rb: 28:in call' …ionpack-4.2.3/lib/action_dispatch/middleware/ static.rb: 116:incall'
…bundle/ruby/2.2.0/gems/rack-1.6.4/lib/rack/
sendfile.rb: 113:in call' …undle/ruby/2.2.0/gems/rack-cors-0.4.0/lib/rack/ cors.rb: 80:incall'
…dle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/
engine.rb: 518:in call' …uby/2.2.0/gems/railties-4.2.3/lib/rails/ application.rb: 165:incall'
…le/ruby/2.2.0/gems/railties-4.2.3/lib/rails/
railtie.rb: 194:in public_send' …le/ruby/2.2.0/gems/railties-4.2.3/lib/rails/ railtie.rb: 194:inmethod_missing'
…/ruby/2.2.0/gems/puma-2.11.3/lib/puma/
configuration.rb: 51:in call' …/bundle/ruby/2.2.0/gems/puma-2.11.3/lib/puma/ server.rb: 507:inhandle_request'
…/bundle/ruby/2.2.0/gems/puma-2.11.3/lib/puma/
server.rb: 375:in process_client' …/bundle/ruby/2.2.0/gems/puma-2.11.3/lib/puma/ server.rb: 262:inblock in run'
…le/ruby/2.2.0/gems/puma-2.11.3/lib/puma/
thread_pool.rb: 104:in call' …le/ruby/2.2.0/gems/puma-2.11.3/lib/puma/ thread_pool.rb: 104:inblock in spawn_thread'