bootstrapで謎のエラーが出ている

###現在出ている問題
bootstrapを入れているのですが、いきなり下記のエラーが出るようになりました。
cssは最初からscssで行なっていますが、下記のエラーが突然出るようになった原因がわからずに難航しております。
同じ経験をされた方いらっしゃればご教授いただきたく存じます。
よろしくお願いいたします。

###エラー内容
ActionController::RoutingError (No route matches [GET] "/assets/bootstrap-reboot.css.map"):

###ターミナル画面
ActionController::RoutingError (No route matches [GET] "/assets/bootstrap-reboot.css.map"):

actionpack (5.1.7) lib/action_dispatch/middleware/debug_exceptions.rb:63: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:22: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 (5.1.7) lib/action_dispatch/middleware/show_exceptions.rb:31:in call'
railties (5.1.7) lib/rails/rack/logger.rb:36:in call_app' railties (5.1.7) lib/rails/rack/logger.rb:24:in block in call'
activesupport (5.1.7) lib/active_support/tagged_logging.rb:69:in block in tagged' activesupport (5.1.7) lib/active_support/tagged_logging.rb:26:in tagged'
activesupport (5.1.7) lib/active_support/tagged_logging.rb:69:in tagged' railties (5.1.7) lib/rails/rack/logger.rb:24:in call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:11:in block in call' activesupport (5.1.7) lib/active_support/logger_silence.rb:20:in silence'
activesupport (5.1.7) lib/active_support/logger.rb:63:in block (3 levels) in broadcast' activesupport (5.1.7) lib/active_support/logger_silence.rb:20:in silence'
activesupport (5.1.7) lib/active_support/logger.rb:61:in block (2 levels) in broadcast' sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:11:in call'
actionpack (5.1.7) lib/action_dispatch/middleware/remote_ip.rb:79:in call' actionpack (5.1.7) lib/action_dispatch/middleware/request_id.rb:25: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 (5.1.7) lib/active_support/cache/strategy/local_cache_middleware.rb:27:in call' actionpack (5.1.7) lib/action_dispatch/middleware/executor.rb:12:in call'
actionpack (5.1.7) lib/action_dispatch/middleware/static.rb:125:in call' rack (2.0.7) lib/rack/sendfile.rb:111:in call'
railties (5.1.7) 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'