在rails 5中进行开发后，我转到了rails 6，在运行rails服务器时遇到了一个错误。当我去localhost://3000浏览器显示的是一个空白页面，没有其他内容。有人有同样的问题吗？重要提示：这个空白页是在我安装了带纱线的引导程序后开始显示的。PD：我使用工头来运行puma并编译webpacker，但rails的命令也是如此
以下是来自服务器的日志：
10:07:50 web.1 | started with pid 11365
10:07:50 webpacker.1 | started with pid 11366
10:07:52 web.1 | Puma starting in single mode...
10:07:52 web.1 | * Version 4.3.1 (ruby 2.7.0-p0), codename: Mysterious Traveller
10:07:52 web.1 | * Min threads: 5, max threads: 5
10:07:52 web.1 | * Environment: development
10:07:57 webpacker.1 | ℹ ｢wds｣: Project is running at http://localhost:3035/
10:07:57 webpacker.1 | ℹ ｢wds｣: webpack output is served from /packs/
10:07:57 webpacker.1 | ℹ ｢wds｣: Content not from webpack is served from /home/enzo/Ruby/Rails/Aguara/aguara/public/packs
10:07:57 webpacker.1 | ℹ ｢wds｣: 404s will fallback to /index.html
10:08:06 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:06 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
10:08:07 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/type.rb:27: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:07 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/type/adapter_specific_registry.rb:9: warning: The called method `add_modifier' is defined here
10:08:08 web.1 | * Listening on tcp://0.0.0.0:5000
10:08:08 web.1 | Use Ctrl-C to stop
10:08:16 webpacker.1 | ℹ ｢wdm｣: Hash: c16cbbe009c350199791
10:08:16 webpacker.1 | Version: webpack 4.41.5
10:08:16 webpacker.1 | Time: 18836ms
10:08:16 webpacker.1 | Built at: 05/04/2020 10:08:16 AM
10:08:16 webpacker.1 | Asset Size Chunks Chunk Names
10:08:16 webpacker.1 | js/application-64644ee2e024eff1d7f7.js 1.72 MiB application [emitted] [immutable] application
10:08:16 webpacker.1 | js/application-64644ee2e024eff1d7f7.js.map 1.89 MiB application [emitted] [dev] application
10:08:16 webpacker.1 | js/bootstrap_custom-4a75b3f7b43b52ae2490.js 929 KiB bootstrap_custom [emitted] [immutable] bootstrap_custom
10:08:16 webpacker.1 | js/bootstrap_custom-4a75b3f7b43b52ae2490.js.map 1.04 MiB bootstrap_custom [emitted] [dev] bootstrap_custom
10:08:16 webpacker.1 | manifest.json 738 bytes [emitted]
10:08:16 webpacker.1 | ℹ ｢wdm｣: Compiled successfully.
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/integer.rb:13: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb:12: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.2.1/lib/active_support/messages/rotator.rb:28: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.2.1/lib/active_support/messages/rotator.rb:6: warning: The called method `initialize' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionview-6.0.2.1/lib/action_view/unbound_template.rb:24: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionview-6.0.2.1/lib/action_view/template.rb:130: warning: The called method `initialize' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activemodel-6.0.2.1/lib/active_model/translation.rb:67: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/i18n-1.7.0/lib/i18n.rb:179: warning: The called method `translate' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/abstract_controller/helpers.rb:67: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_controller/metal/request_forgery_protection.rb:313: warning: The called method `form_authenticity_token' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/railties/collection_cache_association_loading.rb:7: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/railties/collection_cache_association_loading.rb:12: warning: The called method `relation_from_options' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/sprockets-4.0.0/lib/sprockets/base.rb:119: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/sprockets-4.0.0/lib/sprockets/base.rb:78: warning: The called method `find_asset' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/cookies.rb:635: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.2.1/lib/active_support/message_encryptor.rb:150: warning: The called method `encrypt_and_sign' is defined here
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.2.1/lib/active_support/message_encryptor.rb:175: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
10:08:17 web.1 | /home/enzo/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.2.1/lib/active_support/messages/metadata.rb:17: warning: The called method `wrap' is defined here
这是chrome中的网络选项卡：在此处输入图像描述
经过一次艰难的调试，我终于发现yield标签是问题所在，现在我的应用程序又开始工作了哈哈