启动后，访问页面的时候出现以下错误

[liuzhengming]

localhost:coffee-box liuzhengming$ node index.js coffee-box server listening on port 3000 in development mode

/Users/liuzhengming/github/coffee-box/node_modules/mongoose/lib/query.js:1312 if (!Array.isArray(arg[i])) throw new Error("Invalid sort() argument."); ^ Error: Invalid sort() argument. at Query.sort (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/lib/query.js:1312:41) at Query.setOptions (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/node_modules/mquery/lib/mquery.js:183:20) at Query.setOptions (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/lib/query.js:859:32) at Query (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/node_modules/mquery/lib/mquery.js:55:10) at new Query (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/lib/query.js:65:10) at Function.find (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/lib/model.js:938:12) at /Users/liuzhengming/github/coffee-box/app/models/post.coffee:107:20 at Object. (/Users/liuzhengming/github/coffee-box/app/models/post.coffee:89:14) at Object._onImmediate (/Users/liuzhengming/github/coffee-box/node_modules/mongoose/node_modules/mquery/lib/utils.js:137:16) at processImmediate as _immediateCallback