为了学习Angular 2，我正在尝试他们的教程。

我得到一个这样的错误:

(node:4796) UnhandledPromiseRejectionWarning: Unhandled promise rejection (r                                                                                                     ejection id: 1): Error: spawn cmd ENOENT
[1] (node:4796) 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.

我在SO中浏览了不同的问题和答案，但没有找到什么是“未处理的承诺拒绝”。

谁能简单地告诉我它是什么，也什么错误:产卵cmd ENOENT是，当它出现时，我必须检查摆脱这个警告?

当我得到以下错误:

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: spawn ENOENT
    at errnoException (child_process.js:1000:11)
    at Process.ChildProcess._handle.onexit (child_process.js:791:34)

我该采取什么程序来修理呢?

作者注:这个错误的许多问题鼓励我发布这个问题，以供将来参考。

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