Ruby on Rails-What dos-Routing Error:未初始化的常量ActionController

Question

我的Ruby on Rails网站上出现了以下错误：

Routing Error: uninitialized constant ActionController::Responder
lib/application_responder.rb:1:in `<top (required)>'
app/controllers/application_controller.rb:1:in `<top (required)>'
app/controllers/jobs_controller.rb:1:in `<top (required)>'

在错误下面，它显示了一个从上到下优先级匹配的路由表。

它出现在所有页面上，我不确定问题出在哪里，我该如何解决？*我是Rails的新手。

任何帮助都将不胜感激！

更新：不确定是否与我的jobs_controller.rb文件有关，代码为：

class JobsController < ApplicationController
  def index
     @jobs = Job.page(params[:page]).per(20).order(created_at: :desc)
  end
  def new
      @job = Job.new
  end
  def show
      @job = Job.find(params[:id])
  end
  def create
     @job = Job.new(params.require(:job).permit(:human_sum, :position, :company, :salary, :companywebsite, :contract, :city, :expirydate, :jobtype, :description, :apply, :contactname, :contactemail, :contactphone, ))
      if @job.save
        redirect_to root_path
      else
        render "new"
      end
   end
end

lib/application_responder.rb-

class ApplicationResponder < ActionController::Responder
  include Responders::FlashResponder
  include Responders::HttpCacheResponder
  # Redirects resources to the collection path (index action) instead
  # of the resource path (show action) for POST/PUT/DELETE requests.
  # include Responders::CollectionResponder
end

Answer 1

对其他文章进行了一些挖掘，发现如果我运行。。。

sudo gem install responders 

它删除了错误，我的网站又回到了原来的样子。