我将node.js应用程序上传到服务器上，但出现以下错误。 服务器运行Ubuntu 14.04。 我已经将服务器上的节点版本更新为v10.9.0，它仍然给我这个错误：
An error occurred while starting the web application. It exited before
signalling successful startup back to Phusion Passenger. Please read this
article for more information about this problem.
Raw process output:
/home/kevinshirley/tripimagine.com/node_modules/mongoose/lib/index.js:7
const Schema = require('./schema');
^^^^^
SyntaxError: Use of const in strict mode.
at exports.runInThisContext (vm.js:73:16)
at Module._compile (module.js:443:25)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous>
(/home/kevinshirley/tripimagine.com/node_modules/mongoose/index.js:7:18)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)