当在首页点击进入详情页的时候，跳出以下错误，不知道是不是跟express的版本有关系，我现在的express已经不包含body-parser，目前这个包需要独立安装，麻烦看看，谢谢。

TypeError: /root/nodejsWar/imooc/views/pages/index.jade:6
   4| .container
   5| .row
 > 6| - each item in movies
   7| .col-md-2
   8| .thumbnail
   9| a(href="/movie/#{item._id}")

Cannot read property 'length' of undefined
   at eval (eval at exports.compile (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:218:8), <anonymous>:103:31)
   at eval (eval at exports.compile (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:218:8), <anonymous>:224:4)
   at eval (eval at exports.compile (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:218:8), <anonymous>:249:22)
   at res (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:219:38)
   at Object.exports.renderFile (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:380:38)
   at Object.exports.renderFile (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:370:21)
   at View.exports.__express [as engine] (/root/nodejsWar/imooc/node_modules/jade/lib/index.js:417:11)
   at View.render (/root/nodejsWar/imooc/node_modules/express/lib/view.js:128:8)
   at tryRender (/root/nodejsWar/imooc/node_modules/express/lib/application.js:640:10)
   at Function.render (/root/nodejsWar/imooc/node_modules/express/lib/application.js:592:3)