Railsでエラーがおきます。

Railsで下記のエラーはどういうことなのでしょうか？
エラーといいましても、ブラウザ上で問題はありませんが、コマンドのほうでこのような表示がでてあり気持ちがわるいです。
ご教授よろしくお願いします。

Started GET "/posts/index" for ::1 at 2019-07-21 18:41:06 +0900
  ActiveRecord::SchemaMigration Load (0.2ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by PostsController#index as HTML
  Rendering posts/index.html.erb within layouts/application
  Post Load (0.2ms)  SELECT "posts".* FROM "posts"
  Rendered posts/index.html.erb within layouts/application (7.9ms)
Completed 200 OK in 247ms (Views: 229.5ms | ActiveRecord: 1.0ms)


Started GET "/posts/dist/js/swiper.js" for ::1 at 2019-07-21 18:41:07 +0900

ActionController::RoutingError (No route matches [GET] "/posts/dist/js/swiper.js"):

actionpack (5.0.7.2) lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'
web-console (3.7.0) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.7.0) lib/web_console/middleware.rb:30:in `block in call'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `catch'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
railties (5.0.7.2) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.0.7.2) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:69:in `block in tagged'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (5.0.7.2) lib/active_support/tagged_logging.rb:69:in `tagged'
railties (5.0.7.2) lib/rails/rack/logger.rb:24:in `call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/request_id.rb:24:in `call'
rack (2.0.7) lib/rack/method_override.rb:22:in `call'
rack (2.0.7) lib/rack/runtime.rb:22:in `call'
activesupport (5.0.7.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.0.7.2) lib/action_dispatch/middleware/static.rb:136:in `call'
rack (2.0.7) lib/rack/sendfile.rb:111:in `call'
railties (5.0.7.2) lib/rails/engine.rb:522:in `call'
puma (3.12.1) lib/puma/configuration.rb:227:in `call'
puma (3.12.1) lib/puma/server.rb:660:in `handle_request'
puma (3.12.1) lib/puma/server.rb:474:in `process_client'
puma (3.12.1) lib/puma/server.rb:334:in `block in run'
puma (3.12.1) lib/puma/thread_pool.rb:135:in `block in spawn_thread'
  Rendering C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/routing_error.html.erb within rescues/layout
  Rendering C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.5ms)
  Rendered collection of C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/routes/_route.html.erb [2 times] (1.6ms)
  Rendered C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/routes/_table.html.erb (21.4ms)
  Rendering C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (0.6ms)
  Rendered C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/actionpack-5.0.7.2/lib/action_dispatch/middleware/templates/rescues/routing_error.html.erb within rescues/layout (84.2ms)