Heroku compile assets error with unicorn, routing error with subdomain.

error_routing.txt

2013-03-17T20:35:04+00:00 app[web.1]: ActionController::RoutingError (No route matches [GET] "/v1/cities.json"):
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/rack/logger.rb:32:in `call_app'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/rack/logger.rb:16:in `block in call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/tagged_logging.rb:22:in `tagged'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/rack/logger.rb:16:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/action_dispatch/middleware/request_id.rb:22:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/action_dispatch/middleware/static.rb:62:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/engine.rb:479:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/application.rb:223:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/railtie/configurable.rb:30:in `method_missing'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.8.72/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:18:in `call'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:552:in `process_client'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:632:in `worker_loop'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.5.8.72/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:18:in `block (4 levels) in <top (required)>'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:142:in `start'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:500:in `spawn_missing_workers'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.2/bin/unicorn_rails:209:in `<top (required)>'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/bin/unicorn_rails:23:in `load'
2013-03-17T20:35:04+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/bin/unicorn_rails:23:in `<main>'

heroku_error.txt

-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       undefined method `match' for nil:NilClass
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions/mongo_uri.rb:49:in `initialize'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions/factory.rb:103:in `new'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions/factory.rb:103:in `parse'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions/factory.rb:62:in `create_session'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions/factory.rb:43:in `default'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/sessions.rb:109:in `default'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid.rb:124:in `default_session'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.23/lib/mongoid/railtie.rb:142:in `block (2 levels) in <class:Railtie>'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/lazy_load_hooks.rb:34:in `call'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/lazy_load_hooks.rb:34:in `execute_hook'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/lazy_load_hooks.rb:42:in `each'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/application/finisher.rb:59:in `block in <module:Finisher>'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/initializable.rb:30:in `instance_exec'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/initializable.rb:30:in `run'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/initializable.rb:55:in `block in run_initializers'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/initializable.rb:54:in `each'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/initializable.rb:54:in `run_initializers'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/application.rb:136:in `initialize!'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/railtie/configurable.rb:30:in `method_missing'
       /tmp/build_yy2k04m51ro/config/environment.rb:5:in `<top (required)>'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `block in require'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:236:in `load_dependency'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/application.rb:103:in `require_environment!'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/railties-3.2.9/lib/rails/application.rb:297:in `block (2 levels) in initialize_tasks'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/sprockets/assets.rake:93:in `block (2 levels) in <top (required)>'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/sprockets/assets.rake:60:in `block (3 levels) in <top (required)>'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/sprockets/assets.rake:23:in `invoke_or_reboot_rake_task'
       /tmp/build_yy2k04m51ro/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.9/lib/sprockets/assets.rake:29:in `block (2 levels) in <top (required)>'
       Tasks: TOP => environment
       (See full trace by running task with --trace)
       Precompiling assets failed, enabling runtime asset compilation
       Injecting rails31_enable_runtime_asset_compilation
       Please see this article for troubleshooting help:
       http://devcenter.heroku.com/articles/rails31_heroku_cedar#troubleshooting
-----> Rails plugin injection
       Injecting rails_log_stdout
       Injecting rails3_serve_static_assets
-----> Discovering process types
       Procfile declares types      -> web
       Default types for Ruby/Rails -> console, rake, worker

routes.rb

  constraints subdomain: 'api' do
    namespace :api, path: nil, defaults: {format: 'json'} do
      namespace :v1 do
        resources :cities, only: [:index] do
          resources :areas, only: [:index]
        end
      end
    end
  end