我真的是Ruby及其Rails框架的新手，当我使用rails generate命令遇到一些问题时，我正在遵循一个教程。我尝试使用Rails生成脚手架和Rails生成控制器，但是没有用。完整的跟踪是这样的：
/usr/lib/ruby/vendor_ruby/rails/railtie/configuration.rb:95:in `method_missing': undefined method `load_defaults' for #<Rails::Application::Configuration:0x000055cdba53c180> (NoMethodError)
from /home/eric/Projects/blog/config/application.rb:12:in `<class:Application>'
from /home/eric/Projects/blog/config/application.rb:10:in `<module:Blog>'
from /home/eric/Projects/blog/config/application.rb:9:in `<top (required)>'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `require'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `preload'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:153:in `serve'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
from /var/lib/gems/2.5.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
from -e:1:in `<main>'
我认为主要的问题是我缺少'load_defaults'方法，但是我找不到任何有关解决问题的方法。就上下文而言，我将在Ubuntu上一个全新的Rails项目中进行所有操作-到目前为止，我唯一要做的事情是rails new和bundle install。
有点奇怪，这个问题仅在我创建的新的Rails项目中弹出。我尝试在我之前拥有的项目上使用rails generate命令，并且它可以正常工作。我无法弄清楚项目之间有什么不同。
任何建议将不胜感激！