Redmine

Did you run db:migrate?

I haven't.
After I migrated this error disappeared, but another one appeared:

Started GET "/login" for 192.168.142.1 at 2013-08-09 12:04:28 +0300
Processing by AccountController#login as HTML
  Current user: anonymous
  Rendered account/login.html.erb within layouts/base (3.0ms)
  Rendered plugins/redmine_code_review/app/views/code_review/_html_header.html.erb (0.0ms)
  Rendered plugins/clipboard_image_paste/app/views/clipboard_image_paste/_headers.html.erb (3.0ms)
  Rendered plugins/redmine_favourite_projects/app/views/favourite_projects/_favourite_projects_searchbox_partial.html.erb (0.0ms)
  Rendered plugins/sidebar_hide/app/views/sidebar/_hideButton_partial.html.erb (1.0ms)
  Rendered plugins/redmine_code_review/app/views/code_review/_body_bottom.html.erb (0.0ms)
  Rendered plugins/redmine_favourite_projects/app/views/favourite_projects/_update_menu.erb (0.0ms)
  Rendered plugins/clipboard_image_paste/app/views/clipboard_image_paste/_add_form.html.erb (3.0ms)
Completed 200 OK in 43ms (Views: 32.0ms | ActiveRecord: 8.0ms)
Started POST "/login" for 192.168.142.1 at 2013-08-09 12:04:33 +0300
Processing by AccountController#login as HTML
  Parameters: {"utf8"=>"вњ“", "authenticity_token"=>"Xv5pNso+5RHnui77LAe6CLmOcc4XlbcpYV8uYWoiitg=", "username"=>"jwalker", "password"=>"[FILTERED]", "login"=>"Р’С…РѕРґ В»"}
  Current user: anonymous
Successful authentication for 'jwalker' from 192.168.142.1 at 2013-08-09 09:04:33 UTC
Redirected to http://walker:3000/my/page
Completed 302 Found in 96ms (ActiveRecord: 86.0ms)

NoMethodError (undefined method `options' for {:user_id=>30, :ctime=>1376039073, :atime=>1376039073}:Hash):
  rack (1.5.2) lib/rack/session/abstract/id.rb:329:in `commit_session'
  rack (1.5.2) lib/rack/session/abstract/id.rb:226:in `context'
  rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call'
  activerecord (3.2.13) lib/active_record/query_cache.rb:64:in `call'
  activerecord (3.2.13) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__931039574__call__745825685__callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call'
  activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call'
  rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
  rack-cache (1.2) lib/rack/cache/context.rb:143:in `pass'
  rack-cache (1.2) lib/rack/cache/context.rb:155:in `invalidate'
  rack-cache (1.2) lib/rack/cache/context.rb:71:in `call!'
  rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
  railties (3.2.13) lib/rails/engine.rb:479:in `call'
  railties (3.2.13) lib/rails/application.rb:223:in `call'
  railties (3.2.13) lib/rails/railtie/configurable.rb:30:in `method_missing'
  rack (1.5.2) lib/rack/commonlogger.rb:33:in `call'
  puma (1.6.3) lib/puma/server.rb:412:in `handle_request'
  puma (1.6.3) lib/puma/server.rb:306:in `process_client'
  puma (1.6.3) lib/puma/server.rb:215:in `block in run'
  puma (1.6.3) lib/puma/thread_pool.rb:94:in `call'
  puma (1.6.3) lib/puma/thread_pool.rb:94:in `block in spawn_thread'

I see the same problem with Redmine 2.3.3 and rack 1.5.2, with a fresh, empty installation (Debian unstable).

NoMethodError (undefined method `options' for {:user_id=>1, :ctime=>1385393559, :atime=>1385393559}:Hash):
  /usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:329:in `commit_session'
  /usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:226:in `context'
  /usr/lib/ruby/vendor_ruby/rack/session/abstract/id.rb:220:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/cookies.rb:341:in `call'
  /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:64:in `call'
  /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  /usr/lib/ruby/vendor_ruby/active_support/callbacks.rb:405:in `_run__804960317947970016__call__965880645813303244__callbacks'
  /usr/lib/ruby/vendor_ruby/active_support/callbacks.rb:405:in `__run_callback'
  /usr/lib/ruby/vendor_ruby/active_support/callbacks.rb:385:in `_run_call_callbacks'
  /usr/lib/ruby/vendor_ruby/active_support/callbacks.rb:81:in `run_callbacks'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/callbacks.rb:27:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/reloader.rb:65:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/remote_ip.rb:31:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  /usr/lib/ruby/vendor_ruby/rails/rack/logger.rb:32:in `call_app'
  /usr/lib/ruby/vendor_ruby/rails/rack/logger.rb:18:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/request_id.rb:22:in `call'
  /usr/lib/ruby/vendor_ruby/rack/methodoverride.rb:21:in `call'
  /usr/lib/ruby/vendor_ruby/rack/runtime.rb:17:in `call'
  /usr/lib/ruby/vendor_ruby/active_support/cache/strategy/local_cache.rb:72:in `call'
  /usr/lib/ruby/vendor_ruby/rack/lock.rb:17:in `call'
  /usr/lib/ruby/vendor_ruby/action_dispatch/middleware/static.rb:63:in `call'
  /usr/lib/ruby/vendor_ruby/rails/engine.rb:479:in `call'
  /usr/lib/ruby/vendor_ruby/rails/application.rb:223:in `call'
  /usr/lib/ruby/vendor_ruby/rails/railtie/configurable.rb:30:in `method_missing'
  /usr/lib/ruby/vendor_ruby/rack/builder.rb:138:in `call'
  /usr/lib/ruby/vendor_ruby/rack/urlmap.rb:65:in `block in call'
  /usr/lib/ruby/vendor_ruby/rack/urlmap.rb:50:in `each'
  /usr/lib/ruby/vendor_ruby/rack/urlmap.rb:50:in `call'
  /usr/lib/ruby/vendor_ruby/unicorn/http_server.rb:580:in `process_client'
  /usr/lib/ruby/vendor_ruby/unicorn/http_server.rb:660:in `worker_loop'
  /usr/lib/ruby/vendor_ruby/unicorn/http_server.rb:527:in `spawn_missing_workers'
  /usr/lib/ruby/vendor_ruby/unicorn/http_server.rb:153:in `start'
  /usr/bin/unicorn_rails:209:in `<main>'

See also

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730494

Got into the same problem migrating from Mysql to Postgresql 9.4

In the end everything worked fine, just some db:migrate, I had to drop a couple of tables in order to be able to run db:migrate, but it worked.