NoMethodエラーが出ました

Question

rails入門書を見ながらメッセージボードを作っています。
「NoMethod 」エラーが出てしまいました。

エラー内容

NoMethodError in BoardMessagesController#index
undefined method `authenticate_account!' for #<BoardMessagesController:0x00007ff175d69ef8> Did you mean? authenticate_with_http_basic
Extracted source (around line #428):
426 
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          lambda do |target, value, &block|
            target, block, method, *arguments = expand(target, value, block)
            target.send(method, *arguments, &block)
          end
        end

メソッドが定義されていないというのはわかりました。
しかし、具体的にどうコードを書きなおせば良いのかわかりません。

コントローラー内容

class BoardMessagesController < ApplicationController
  before_action :set_board_message, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_account!
  layout 'board_message'

  # GET /board_messages
  # GET /board_messages.json
  def index
    @board_messages = BoardMessage.page(params[:page]).order('created_at desc')
    users = BoardUser.where('account_id == ?', current_account.id)[0]
    if users == nil then
      user = BoardUser.new
      user.account_id = current_accunt.id
      user.nickname = '<<no name>>'
      user.save
      users = BoardUser.where 'account_id == ?', current_account.id
    end
    @board_user = users
    @board_message = BoardMessage.new
    @board_message.board_user_id = @board_user_id
  end

  # GET /board_messages/1
  # GET /board_messages/1.json
  def show
    redirect_to '/board_messages'
  end

  # GET /board_messages/new
  def new
    redirect_to '/board_messages'
  end

  # GET /board_messages/1/edit
  def edit
    redirect_to '/board_messages'
  end

  # POST /board_messages
  # POST /board_messages.json
  def create
    @board_message = BoardMessage.page(params[:page]).order('created_at desc')
    @board_message = BoardMessage.new(board_message_params)
    @board_user = BoardUser.where('account_id == ?', current_account.id)[0]
    respond_to do |format|
      if @board_message.save
        format.html { redirect_to '/board_messages' }
        format.json { render :show, status: :created, location: @board_message }
      else
        format.html { render :index }
        format.json { render json: @board_message.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /board_messages/1
  # PATCH/PUT /board_messages/1.json
  def update
    redirect_to '/board_messages'
  end

  # DELETE /board_messages/1
  # DELETE /board_messages/1.json
  def destroy
    redirect_to '/board_messages'
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_board_message
      @board_message = BoardMessage.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def board_message_params
      params.require(:board_message).permit(:content, :board_user_id)
    end
end

Answer 1

class BoardMessagesController < ApplicationController
  before_action :set_board_message, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_account!

とありますが

controllerのなかに
authenticate_account!が定義されていない気がします