How to fix the "This project is configured to use Yarn" error on pnpm install

The "This project is configured to use Yarn" error happens in pnpm install when you have a field in your package.json file that specifies Yarn as the package manager.

The package.json field may have come about when you ran a yarn set version ... command, for example, yarn set version stable to set up Yarn Berry, or yarn set version berry to migrate from Yarn v1 to Yarn Berry.

Fix "This project is configured to use Yarn" error

To fix the this pnpm install usage error, simply remove the "packageManager" field from package.json:

Once you do that, pnpm install will run properly.

Try Coding Beauty AI Assistant for VS Code

Meet the new intelligent assistant: tailored to optimize your work efficiency with lightning-fast code completions, intuitive AI chat + web search, reliable human expert help, and more.

Check it out

See also

• How to quickly fix the "Cannot read property 'then' of undefined" error in JavaScript
• How to Fix the "Unexpected strict mode reserved word 'yield'" Error in JavaScript
• How to easily fix the EAI_AGAIN error in NPM, Yarn, or PNPM
• How to quickly fix the ERR_OSSL_EVP_UNSUPPORTED error in Node.js
• How to fix the "__dirname is not defined in ES module scope" error in JavaScript
• How to easily fix the "Cannot read property 'classList' of null" error in JavaScript