ActionView::Template::Error (Undefined method new_contract_months_path for ) after remove model

I got this error when I tried to create a simple form in rails 3. My _new_contract_month.html.erb is:

<% provide(:title, 'New Contract') %>
<div class="row">
    <div>
        <%= form_for NewContractMonth.new, url: new_contract_month_path do |f| %>
                <%= f.label :serial_number, "Serial Number", :size => 60 %>
                <%= f.text_field :serial_number %>
                <%= f.label :sale, "Sele", :size => 60 %>
                <%= f.text_field :sale %>
                <%= f.label :goal_profit, "Goal profit rate", :size => 60%>
                <%= f.text_field :goal_profit %>
                <%= f.label :alert_mail, "Alert Mail" %>
                <%= f.check_box :alert_mail %>
                <%= f.label "Date" %>
                <%= f.select :date, NewContractMonth::DATE.collect {|s| [l("date_#{s}"), s]}%>
                <%= f.label "Start Date"%>
                <%= f.text_field :start_date, :size => 10 %><%= calendar_for('new_contract_month_start_date') %>
                <%= f.label "End Date"%>
                <%= f.text_field :end_date, :size => 10 %><%= calendar_for('new_contract_month_end_date') %>
                <%= f.label "Description", :size => 100%>
                <%= f.textfield :description%>
                <%= f.label "Status"%>
                <%= f.select :status, NewContractMonth::STATUS.collect {|f| [l("status_#{f}"), f]}%>
        <% end %>
        <%= f.summit "Save"%>
    </div>
</div>

my route.rb is:

# Plugin's routes
# See: http://ift.tt/GVpneB
if Rails.version.to_f >= 3.0
  match 'attendance_time_money/index/:id', :to => 'attendance_time_money#index', :via => :get
  match 'analysis_time_money/index/:id', :to => 'analysis_time_money#index', :via => :get
  match 'setting_time_money/index/:id', :to => 'setting_time_money#index', :via => :get
  match 'setting_time_money/new/:id' , :to => 'setting_time_money#new', :via => :get
  match 'setting_time_money/new_contract_month/:id' , :to => 'setting_time_money#new_contract_month', :via => :get


else # Routes for older Rails routes
  ActionController::Routing::Routes.draw do |map|
   map.connect '/attendance_time_money/index/:id', :controller => 'attendance_time_money', :action => 'index'
   map.connect '/analysis_time_money/index/:id', :controller => 'analysis_time_money', :action => 'index'
   map.connect '/setting_time_money/index/:id', :controller => 'setting_time_money', :action => 'index'
  end
end

my controller:

class SettingTimeMoneyController < ApplicationController
  unloadable


  def index
    @new_contract_month = NewContractMonth.all
    @new_contract_version = NewContractMonth.all
  end

  def new_contract_month
    @new_contract_month ||= NewContractMonth.new
    @new_contract_version ||= NewContractVersion.new
  end

  def edit_contract
    @new_contract_month = NewContractMonth.find(params[:id])
    @new_contract_version = NewContractMonth.find(params[:id])
  end

  def update_contract
    respond_to do |format|
      if @new_contract.update(new_contract_params)
        format.html { redirect_to @new_contract, notice: 'New contract was successfully updated'}
        format.json { head :no_content }
      else
        format.html { render 'new_contract'}
        format.json { render json: @new_contract.errors, status: :unprocessable_entity }
      end
     end
  end


end

I searched google and find a solution to fix this problem by add :as => new_contract_month to route file. Unfortunately, after that, I delete my new_contract_month.rb model and then add it again(the same name, with more attributes). When I run my app again, the error comeback and I get stuck until now. So can someone help me?