list中的代码如下：

extends ../layout

block content

    .container

        .row

            table.table.table-hover.table-bordered

                thead

                    tr

                        th 电影名字

                        th 导演

                        th 国家

                        th 上映年份

                        //th 录入时间

                        th 查看

                        th 更新

                        th 删除

                tbody

                    each item in movies

                        tr(class="item-id-#{item._id}")

                            td #{item.title}

                            td #{item.doctor}

                            td #{item.country}

                            td #{item.year}

                            //td #{moment(item.meta.createdAt).format("MM/DD/YYYY")}

                            td: a(target="_blank" href="../movie/#{item._id}") 查看

                            td: a(target="_blank" href="../admin/update/#{item._id}") 修改

                            td

                                button.btn.btn-danger.del(type="button"

                                data-id="#{item._id}")删除

app中的list模块的代码如下：

app.get("/admin/list",function(req,res){

    res.render("list",{

        title:'imooc 列表页',

        movies:[{

            doctor:'尼古拉斯-赵四',

            country:'美国',

            title:'机械战警',

            _id:1,

            year:2014,

            poster:'http://r3.yking.com/05160000530EEB63675839160D0B79D5',

            language:'英语',

            flash:'http://player.youku.com/player.php/sid/XNjA1Njc0NTUy/v.swf',

            summary:'这是一部前无古人后无来者的片子，影片中主要讲述了一群机器人妄想统治                地球但是地球突然停'

        }]

    })

})

app中和list中都是movies，但是却报错

TypeError: e:\imooc\views\pages\list.jade:17
   15| th 删除 
   16| tbody 
 > 17| each item in movies 
   18| tr(class="item-id-#{item._id}") 
   19| td #{item.title} 
   20| td #{item.doctor} 

Cannot read property 'length' of undefined
   at eval (eval at <anonymous> 

到底错在哪里呢