wairi@my-pc：~/Development/code/phase-3/phase-3-sinatra-with-active-record-post-patch-delete $bundle exec rake server [DEPRECATED] Bundler.with_clean_env已被弃用，转而支持Bundler.with_unbundled_env。如果您想要在最初加载bundler之前的环境，请使用Bundler.with_original_env（在/var/lib/gems/3.0.0/gems/rerun-0.14.0/lib/rerun/notification. rb：74调用）
十六：09：18 [重新运行]第3阶段-sinatra-with-active-record-post-patch-delete已启动16：09：18 [rerun]重新运行（31476）Phase-3-sinatra-with-active-record-post-patch-delete（31493）/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/handler。rb：四十五：在/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server的pick': Couldn't find handler for: puma, thin, falcon, webrick. (LoadError) from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/handler.rb:60:in default '中。rb：三百三十四：在/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server中的logging_middleware'中的server' from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server.rb:255:in块中。rb：413：in block in build_app' from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server.rb:412:in reverse_each 'from/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server。rb：412：in build_app' from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server.rb:422:in wrapped_app' from/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server。rb：三百一十二：在block in start' from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server.rb:379:in handle_profiling中，来自/var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server。rb：311：在start' from /var/lib/gems/3.0.0/gems/rack-2.2.7/lib/rack/server.rb:168:in中，从/var/lib/gems/3.0.0/gems/rack-2.2.7/bin/rackup开始：5：在<top (required)>' from /usr/local/bin/rackup:25:in中，从/usr/local/bin/rackup加载'：二十五：在`'
16：09：20 [rerun] Phase-3-sinatra-with-active-record-post-patch-delete Launch Failed 16：09：20 [rerun] Watching. for**/*.{rb，js，coffee，css，scss，sass，erb，html，haml，ru，yml，slim，md，feature，c，h} with Linux adapter ^[[A ^C 16：14：14 [rerun] Phase-3-sinatra-with-active-record-post-patch-delete stopping

• 实际上，我意识到实验室在选择使用哪种宝石时有问题。我在gemfile中添加了gem 'thin'，它工作了，你也可以试试`gem 'puma'*