ActionController::RoutingError: No route matches [GET] "/favicon.ico"

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ActionController::RoutingError: No route matches [GET] "/favicon.ico"
  File "/app/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/debug_exceptions.rb", line 21, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/rollbar-0.12.10/lib/rollbar/middleware/rails/show_exceptions.rb", line 19, in call_with_rollbar
  File "/app/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/show_exceptions.rb", line 30, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/rack/logger.rb", line 38, in call_app
  File "/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/rack/logger.rb", line 20, in block in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/tagged_logging.rb", line 67, in block in tagged
  File "/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/tagged_logging.rb", line 25, in tagged
  File "/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/tagged_logging.rb", line 67, in tagged
  File "/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/rack/logger.rb", line 20, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.2/lib/action_dispatch/middleware/request_id.rb", line 21, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/rack-1.5.2/lib/rack/methodoverride.rb", line 21, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/rack-1.5.2/lib/rack/runtime.rb", line 17, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/rack-1.5.2/lib/rack/sendfile.rb", line 112, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/engine.rb", line 511, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/application.rb", line 97, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb", line 572, in process_client
  File "/app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb", line 666, in worker_loop
  File "/app/vendor/bundle/ruby/2.0.0/gems/newrelic_rpm-3.7.2.192/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb", line 22, in call
  File "/app/vendor/bundle/ruby/2.0.0/gems/newrelic_rpm-3.7.2.192/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb", line 22, in block (4 levels) in <top (required)>
  File "/app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb", line 521, in spawn_missing_workers
  File "/app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb", line 140, in start
  File "/app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.8.2/bin/unicorn", line 126, in <top (required)>
  File "/app/vendor/bundle/ruby/2.0.0/bin/unicorn", line 23, in load
  File "/app/vendor/bundle/ruby/2.0.0/bin/unicorn", line 23, in <main>