Ruby on Rails-什么-路由错误：未初始化的常量ActionController :: Responder-平均值，我该如何解决？

Question

我的Ruby on Rails网站上出现以下错误：

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)>'

在错误下方，其显示了从上到下优先级匹配的路由表。

它出现在所有页面上，我不确定是什么问题，如何解决？ *我是Rails的新手。

任何帮助将不胜感激！

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

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

做了一些其他文章的挖掘，发现如果我跑了...

sudo gem install responders 

它消除了错误，并且我的网站恢复了原来的状态。