我已经使用node.js作为服务器并使用mongoDB编写了一个应用程序。在本地使用时，它工作正常，并且部署说成功，但是当我打开应用程序时，它因错误而崩溃了。
我曾尝试在heroku上为mongoURI和jwtSecret设置config vars，但似乎无法解决问题，因为它说mongoURI未定义。
这是heroku日志的示例
Error: Configuration property "mongoURI" is not defined
2019-07-12T14:13:27.306966+00:00 app[web.1]: at Config.get (/app/node_modules/config/lib/config.js:203:11)
2019-07-12T14:13:27.306968+00:00 app[web.1]: at Object.<anonymous> (/app/server.js:11:19)
2019-07-12T14:13:27.319772+00:00 app[web.1]: npm ERR! shopping-list@1.0.0 start: `node server.js`
2019-07-12T14:13:27.320564+00:00 app[web.1]: npm ERR! Failed at the shopping-list@1.0.0 start script.
2019-07-12T14:13:27.320788+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2019-07-12T19:55:27.399289+00:00 app[web.1]: WARNING: NODE_ENV value of 'production' did not match any deployment config file names.
No configurations found in configuration directory:/app/config
2019-07-13T01:26:07.013405+00:00 app[api]: Set mongoURI config vars by user
2019-07-13T01:29:40.779826+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/"
在此处链接到git代码：