ruby-on-rails – Rails错误“NoMethodError” – 我的第一个rub

我的页面正在生成此错误

NoMethodError in Tasks#new
Showing app/views/tasks/new.erb where line #3 raised:

undefined method `tasks_path' for #

这是观点：

<% form_for(@task) do |f| %>
    <%= f.error_messages %>

    <%= f.label :description %>:
    <%= f.text_field :description %><br />

    <%= f.label :priority %>:
    <%= collection_select(:news,:priority_id,Priority.find(:all),:id,:description) %><br />

    <%= f.submit "Add Task" %>

<% end %>

控制器：

class TasksController < ApplicationController
    def index
        @all_tasks = Task.find(:all,:order => :id)
    end

    def new
        @task = Task.new
    end ...(more)

和模型：

我看不出有什么问题,但就像我说的那样,到目前为止我还是一无所知.
谢谢！

class Task < ActiveRecord::Base
    validates_presence_of :description

    belongs_to :priority
    has_and_belongs_to_many :staff
    has_and_belongs_to_many :catagory

end