There is a project that needs to use UMI, so it is decided to use the scaffolding method of UMI to create the project, which can save a lot of things, although it should not be advocated. But there is the problem of line and surface

PS F:\data-train> yarn create umi
yarn create v1.21.1
[1/4] Resolving packages...
[2/4] Fetching packages...
error An unexpected error occurred: "C:\\Users\\num\\AppData\\Local\\Yarn\\Cache\\v6\\npm-doctrine-2.1.0-5cd01fc101621b42c4cd7f5d1a66243716d3f39d-integrity\\node_modules\\doctrine\\.yarn-metadata.json: Unexpected end of JSON input".
info If you think this is a bug, please open a bug report with the information provided in "C:\\Users\\num\\AppData\\Local\\Yarn\\Data\\global\\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.
PS F:\data-train> npm create umi
npm ERR! code ENOLOCAL
npm ERR! Could not install from "Data\npm-cache\_npx\13476" as it does not contain a package.json file.

npm ERR! A complete log of this run can be found in:
npm ERR!     d:\user\工号\Application Data\npm-cache\_logs\2019-12-21T09_22_57_009Z-debug.log
install create-umi@latest error, error code:1

The error an unexpected error occurred: "C:\\users\\job number\\appdata\\local\\yarn\\cache\\ V6\\npm-document-2.1.0-5cd01fc101621b42c4cd7f5d1a66243716d3f39d integrity\\node_ modules\\doctrine\\.yarn- metadata.json : unexpected end of JSON input "." yarn "is found after changing the\\in to \- metadata.json Delete this file and re execute yarn create UMI to install it