预约数量限制没有实现（web服务器和前端没有处理错误信息） about sad HOT 3 CLOSED

Sun, 21 Dec 2014 17:12:29 GMT business Uncaught exception occurred
Sun, 21 Dec 2014 17:12:29 GMT business Request :
Sun, 21 Dec 2014 17:12:29 GMT business  Headers : { 'content-type': 'application/x-www-form-urlencoded',
  host: 'localhost:3001',
  connection: 'keep-alive',
  'transfer-encoding': 'chunked' }
Sun, 21 Dec 2014 17:12:29 GMT business  Url : /user/reservation/add
Sun, 21 Dec 2014 17:12:29 GMT business  Method : POST
Sun, 21 Dec 2014 17:12:29 GMT business Error:  { [Error: Can't set headers after they are sent.]
  domain: 
   { domain: null,
     _events: { error: [Function: onError] },
     _maxListeners: 10,
     members: [ [Object], [Object] ] },
  domainThrown: true }
Sun, 21 Dec 2014 17:12:29 GMT business Route:  { methods: [ 'POST' ],
  name: 'postuserreservationadd',
  params: {},
  spec: 
   { path: '/user/reservation/add',
     method: 'POST',
     versions: [],
     name: 'postuserreservationadd' } }

/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/mysql/lib/protocol/Parser.js:82
        throw err;
              ^
Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (http.js:689:11)
    at ServerResponse.format (/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/restify/lib/response.js:95:10)
    at ServerResponse.send (/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/restify/lib/response.js:205:24)
    at ServerResponse.json (/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/restify/lib/response.js:139:18)
    at /Users/renfei/Documents/Projects/SAD/base/BusinessServer/controllers/reservation.js:149:45
    at createNext (/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/orm/lib/Model.js:565:12)
    at /Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/orm/lib/Model.js:587:6
    at /Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/orm/lib/Instance.js:612:12
    at Instance.saveInstanceExtra (/Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/orm/lib/Instance.js:334:19)
    at /Users/renfei/Documents/Projects/SAD/base/BusinessServer/node_modules/orm/lib/Instance.js:183:5
worker 14240 died