rake routes即使routes.rb文件为空，我也无法执行。这是输出：
? rake routes
rake aborted!
Don't know how to build task 'routes' (See the list of available tasks with `rake --tasks`)
(See full trace by running task with --trace)
输出rake about：
? rake about
About your application's environment
Rails version 6.1.0
Ruby version ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin19]
RubyGems version 3.1.4
Rack version 2.2.3
Middleware Webpacker::DevServerProxy, Rack::MiniProfiler, ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, ActiveSupport::Cache::Strategy::LocalCache::Middleware, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Sprockets::Rails::QuietAssets, Rails::Rack::Logger, ActionDispatch::ShowExceptions, WebConsole::Middleware, ActionDispatch::DebugExceptions, ActionDispatch::ActionableExceptions, …