Command `yarn add react-native --exact` failed

Question

I tryed to create new project but this happen , I update the core as they said here How to update core-js to core-js@3 dependency? but also no thing help me I use windows 10, what should I do ?

c:\Users\alothman\Desktop>npx react-native init travelApp
This will walk you through creating a new React Native project in c:\Users\alothman\Desktop\travelApp
Using yarn v1.21.1
Installing react-native...
yarn add v1.21.1
info No lockfile found.
[1/4] Resolving packages...
warning react-native > fbjs > [email protected]: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > create-react-class > fbjs > [email protected]: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > fbjs-scripts > [email protected]: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > metro-babel-register > [email protected]: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
[2/4] Fetching packages...
error An unexpected error occurred: "C:\\Users\\alothman\\AppData\\Local\\Yarn\\Cache\\v6\\npm-@babel-runtime-7.7.7-194769ca8d6d7790ec23605af9ee3e42a0aa79cf-integrity\\node_modules\\@babel\\runtime\\.yarn-metadata.json: Unexpected token \u0000 in JSON at position 0".
info If you think this is a bug, please open a bug report with the information provided in "c:\\Users\\alothman\\Desktop\\travelApp\\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
{ Error: Command failed: yarn add react-native --exact
    at checkExecSyncError (child_process.js:629:11)
    at execSync (child_process.js:666:13)
    at run (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:294:5)
    at createProject (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:249:3)
    at init (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:200:5)
    at Object.<anonymous> (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:153:7)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
  status: 1,
  signal: null,
  output: [ null, null, null ],
  pid: 5380,
  stdout: null,
  stderr: null }
Command `yarn add react-native --exact` failed.

Answer 1

I think you might be getting this errors because you have previously installed react-native-cli globally. So, first remove react-native-cli using following command:

npm uninstall -g react-native-cli

Now try creating project:

npx react-native init travelApp

Answer 2

npm config set registry "https://registry.npmjs.org"

This worked for me!