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                        /node+mongodb 建站攻略（一期）

TypeError: Cannot read property 'length' of undefined

在執行這段代碼：

_movie.save(function(err,?movie){
????????	if?(err)?{
????????		console.log(err)
????????	}
????????	res.redirect('/movie/'?+?movie._id)
????????})
然后出現如下錯誤：
TypeError:?Cannot?read?property?'length'?of?undefined
???at?eval?(eval?at?<anonymous>?(G:\git\Imovie\node_modules\jade\lib\index.js:216:8),?<anonymous>:93:31)
???at?eval?(eval?at?<anonymous>?(G:\git\Imovie\node_modules\jade\lib\index.js:216:8),?<anonymous>:370:4)
???at?eval?(eval?at?<anonymous>?(G:\git\Imovie\node_modules\jade\lib\index.js:216:8),?<anonymous>:386:22)
???at?res?(G:\git\Imovie\node_modules\jade\lib\index.js:217:38)
???at?Object.exports.renderFile?(G:\git\Imovie\node_modules\jade\lib\index.js:360:38)
???at?View.exports.renderFile?[as?engine]?(G:\git\Imovie\node_modules\jade\lib\index.js:350:21)
???at?View.render?(G:\git\Imovie\node_modules\express\lib\view.js:93:8)
???at?EventEmitter.app.render?(G:\git\Imovie\node_modules\express\lib\application.js:530:10)
???at?ServerResponse.res.render?(G:\git\Imovie\node_modules\express\lib\response.js:933:7)
???at?Promise.<anonymous>?(G:\git\Imovie\app.js:40:8)