[英]How to fix UnhandledPromiseRejectionWarning: TypeError?
So I am making a web app using Express.JS and MongoDB and when I try to run it locally, it works, but when I run it with my aws Ubuntu 20.04 machine it gives me the following error:所以我正在使用 Express.JS 和 MongoDB 制作一个 web 应用程序,当我尝试在本地运行它时,它可以工作,但是当我用我的 aws Ubuntu 20.04 机器运行它时,它会给我以下错误:
(node:13452) UnhandledPromiseRejectionWarning: TypeError: [objectOptions,urlOptions,exports.DEFAULT_OPTIONS].flatMap is not a function
at parseOptions (/home/ubuntu/tylertv/node_modules/mongodb/lib/connection_string.js:258:77)
at new MongoClient (/home/ubuntu/tylertv/node_modules/mongodb/lib/mongo_client.js:62:63)
at Promise (/home/ubuntu/tylertv/node_modules/mongoose/lib/connection.js:784:16)
at new Promise (<anonymous>)
at NativeConnection.Connection.openUri (/home/ubuntu/tylertv/node_modules/mongoose/lib/connection.js:781:19)
at _mongoose._promiseOrCallback.cb (/home/ubuntu/tylertv/node_modules/mongoose/lib/index.js:342:10)
at Promise (/home/ubuntu/tylertv/node_modules/mongoose/lib/helpers/promiseOrCallback.js:32:5)
at new Promise (<anonymous>)
at promiseOrCallback (/home/ubuntu/tylertv/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:10)
at Mongoose._promiseOrCallback (/home/ubuntu/tylertv/node_modules/mongoose/lib/index.js:1181:10)
(node:13452) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:13452) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
I have no clue why this is doing this all I have installed is mongodb,npm, and node.我不知道为什么这样做我安装的是 mongodb、npm 和节点。
https://www.github.com/tttylerr/tylertv https://www.github.com/tttylerr/tylertv
^ My source code is server.js mainly ^ 我的源代码主要是 server.js
This could happen by several reasons:这可能有以下几个原因:
PS If that error occurs on startup, then the error can be interpreted as - "Couldn't connect to MongoDB instance". PS 如果该错误发生在启动时,则该错误可以解释为 - “无法连接到 MongoDB 实例”。 Check that stuff related to Mongo.
检查与 Mongo 相关的内容。
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