by Sai gowtham

How to fix the TypeError [ERR_INVALID_ARG_TYPE]: The path argument must be of type string

In this tutorial, we are going to learn about how to fix the TypeError [ERRINVALIDARG_TYPE]: The “path” argument must be of type string. Received type undefined raised when starting the react app.

When we run an npm start or yarn start command in our project, the following error is sometimes printed in our terminal.

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined
    at validateString (internal/validators.js:125:11)
    at Object.resolve (path.js:161:7)
    at resolveApp (E:\Apps\react-app\orders\config\paths.js:10:41)
    at Object.<anonymous> (E:\Apps\react-app\orders\config\paths.js:73:13)
    at Module._compile (internal/modules/cjs/loader.js:776:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:690:17)
npm ERR! code ELIFECYCLE
npm ERR! errno 1

This error occurs if we are using the old version of the react-scripts package in our project, to fix this error follow the below steps.

  1. First, remove the node_modules folder inside your project directory using the below command.
rm-rf node_modules

or you can remove it manually by right-clicking on it and select the delete option.

  1. Update the react-script version to the latest.
npm install react-scripts@latest

# for yarn
yarn install react-scripts@latest
  1. Re-install the node modules again by running the npm install command.
  2. Now, start the project using the below command.
npm start

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