TypeError: /home/jiangyangyang/workspace/using-nodejs-and-express-realize-a-website-of-moive/view/pages/index.jade:6 ? 4| ? .container ? 5| ? ? .row > 6| ? ? ? -each item in movies ? 7| ? ? ? ? .col-md-2 ? 8| ? ? ? ? .thumbnail Cannot read property 'length' of undefined 這個是為什么？