NoMethodError in PostsController#create

[dflynn15]

After cloning this project and updating rake (now up to 0.9.2) I ran into this issue when submitting a new post:

NoMethodError in PostsController#create
undefined method `path' for #ActionDispatch::Http::UploadedFile:0x00000100e94610

I am not entirely sure what exactly the issue is or exactly how to fix it. Here is the full stack trace:

paperclip (3.1.2) lib/paperclip/io_adapters/uploaded_file_adapter.rb:19:in cache_current_values' paperclip (3.1.2) lib/paperclip/io_adapters/uploaded_file_adapter.rb:5:ininitialize'
paperclip (3.1.2) lib/paperclip/io_adapters/registry.rb:29:in new' paperclip (3.1.2) lib/paperclip/io_adapters/registry.rb:29:infor'
paperclip (3.1.2) lib/paperclip/attachment.rb:91:in assign' paperclip (3.1.2) lib/paperclip.rb:195:inblock in has_attached_file'
activerecord (3.0.3) lib/active_record/base.rb:1559:in block in attributes=' activerecord (3.0.3) lib/active_record/base.rb:1555:ineach'
activerecord (3.0.3) lib/active_record/base.rb:1555:in attributes=' activerecord (3.0.3) lib/active_record/base.rb:1406:ininitialize'
activerecord (3.0.3) lib/active_record/reflection.rb:173:in new' activerecord (3.0.3) lib/active_record/reflection.rb:173:inbuild_association'
activerecord (3.0.3) lib/active_record/associations/association_collection.rb:510:in build_record' activerecord (3.0.3) lib/active_record/associations/association_collection.rb:119:inbuild'
activerecord (3.0.3) lib/active_record/nested_attributes.rb:372:in block in assign_nested_attributes_for_collection_association' activerecord (3.0.3) lib/active_record/nested_attributes.rb:367:ineach'
activerecord (3.0.3) lib/active_record/nested_attributes.rb:367:in assign_nested_attributes_for_collection_association' activerecord (3.0.3) lib/active_record/nested_attributes.rb:254:inassets_attributes='
activerecord (3.0.3) lib/active_record/base.rb:1559:in block in attributes=' activerecord (3.0.3) lib/active_record/base.rb:1555:ineach'
activerecord (3.0.3) lib/active_record/base.rb:1555:in attributes=' activerecord (3.0.3) lib/active_record/base.rb:1406:ininitialize'
app/controllers/posts_controller.rb:16:in new' app/controllers/posts_controller.rb:16:increate'
actionpack (3.0.3) lib/action_controller/metal/implicit_render.rb:4:in send_action' actionpack (3.0.3) lib/abstract_controller/base.rb:151:inprocess_action'
actionpack (3.0.3) lib/action_controller/metal/rendering.rb:11:in process_action' actionpack (3.0.3) lib/abstract_controller/callbacks.rb:18:inblock in process_action'
activesupport (3.0.3) lib/active_support/callbacks.rb:435:in _run__4588436436850707546__process_action__878718467430888215__callbacks' activesupport (3.0.3) lib/active_support/callbacks.rb:409:in_run_process_action_callbacks'
activesupport (3.0.3) lib/active_support/callbacks.rb:93:in run_callbacks' actionpack (3.0.3) lib/abstract_controller/callbacks.rb:17:inprocess_action'
actionpack (3.0.3) lib/action_controller/metal/instrumentation.rb:30:in block in process_action' activesupport (3.0.3) lib/active_support/notifications.rb:52:inblock in instrument'
activesupport (3.0.3) lib/active_support/notifications/instrumenter.rb:21:in instrument' activesupport (3.0.3) lib/active_support/notifications.rb:52:ininstrument'
actionpack (3.0.3) lib/action_controller/metal/instrumentation.rb:29:in process_action' actionpack (3.0.3) lib/action_controller/metal/rescue.rb:17:inprocess_action'
actionpack (3.0.3) lib/abstract_controller/base.rb:120:in process' actionpack (3.0.3) lib/abstract_controller/rendering.rb:40:inprocess'
actionpack (3.0.3) lib/action_controller/metal.rb:138:in dispatch' actionpack (3.0.3) lib/action_controller/metal/rack_delegation.rb:14:indispatch'
actionpack (3.0.3) lib/action_controller/metal.rb:178:in block in action' actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:62:incall'
actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:62:in dispatch' actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:27:incall'
rack-mount (0.6.14) lib/rack/mount/route_set.rb:148:in block in call' rack-mount (0.6.14) lib/rack/mount/code_generation.rb:93:inblock in recognize'
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:75:in optimized_each' rack-mount (0.6.14) lib/rack/mount/code_generation.rb:92:inrecognize'
rack-mount (0.6.14) lib/rack/mount/route_set.rb:139:in call' actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:492:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/best_standards_support.rb:17:in call' actionpack (3.0.3) lib/action_dispatch/middleware/head.rb:14:incall'
rack (1.2.5) lib/rack/methodoverride.rb:24:in call' actionpack (3.0.3) lib/action_dispatch/middleware/params_parser.rb:21:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/flash.rb:182:in call' actionpack (3.0.3) lib/action_dispatch/middleware/session/abstract_store.rb:149:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/cookies.rb:295:in call' activerecord (3.0.3) lib/active_record/query_cache.rb:32:inblock in call'
activerecord (3.0.3) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in cache' activerecord (3.0.3) lib/active_record/query_cache.rb:12:incache'
activerecord (3.0.3) lib/active_record/query_cache.rb:31:in call' activerecord (3.0.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:353:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/callbacks.rb:46:in block in call' activesupport (3.0.3) lib/active_support/callbacks.rb:415:in_run_call_callbacks'
actionpack (3.0.3) lib/action_dispatch/middleware/callbacks.rb:44:in call' rack (1.2.5) lib/rack/sendfile.rb:106:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/remote_ip.rb:48:in call' actionpack (3.0.3) lib/action_dispatch/middleware/show_exceptions.rb:46:incall'
railties (3.0.3) lib/rails/rack/logger.rb:13:in call' rack (1.2.5) lib/rack/runtime.rb:17:incall'
activesupport (3.0.3) lib/active_support/cache/strategy/local_cache.rb:72:in call' rack (1.2.5) lib/rack/lock.rb:13:inblock in call'
internal:prelude:10:in synchronize' rack (1.2.5) lib/rack/lock.rb:13:incall'
actionpack (3.0.3) lib/action_dispatch/middleware/static.rb:30:in call' railties (3.0.3) lib/rails/application.rb:168:incall'
railties (3.0.3) lib/rails/application.rb:77:in method_missing' railties (3.0.3) lib/rails/rack/log_tailer.rb:14:incall'
rack (1.2.5) lib/rack/content_length.rb:13:in call' rack (1.2.5) lib/rack/handler/webrick.rb:52:inservice'
/Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in service' /Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:inrun'
/Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

and the Application trace:
app/controllers/posts_controller.rb:16:in new' app/controllers/posts_controller.rb:16:increate'

I checked the routes and the controller but I can't seem to locate the issue. Ideas?