当我尝试使用 create-react-app 创建一个新的 React 应用程序时，我得到以下信息：
» npx create-react-app my-order
Creating a new React app in /Users/ian/myproject/my-order.
Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts...
yarn add v1.19.0
[1/4] Resolving packages...
[2/4] Fetching packages...
error An unexpected error occurred: "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.2.tgz: Request failed \"404 Not Found\"".
info If you think this is a bug, please open a bug report with the information provided in "/Users/ian/myproject/my-order/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
Aborting installation.
yarnpkg …