The react-scripts package provided by Create React App requires a dependency:

Question

create .env file in your project file and add the following statement

SKIP_PREFLIGHT_CHECK=true

Save the file

Remove node_modules, yarn.lock, package.lock

Then reinstall node_modules with

npm install

This should work

I had the same problem and do all the suggested steps but the problem still, so, my error is that i have a reactApp inside other Javascript App i had this structure.

--MyProjects
----NodeJsApp
----node_modules of NodeJsApp
----package.json of NodeJsApp
----ReactApp
------node_modules of ReactApp
------package.json of ReactApp

The problem solved to me deleting my ReactApp node_modules directory, then i do a reestructure of my directories because i have a disaster.

--MyProjects
----NewDirectory (inside all about NodeJsApp)
------node_modules of NodeJsApp
------package.json of NodeJsApp
----ReactApp
------package.json of ReactApp

After that i do :

npm install

and then npm start and my problem has fixed, i think that the problem is that the parent directory cant have a javascript /nodeJs/ project or something that have node_modules .

Part of the output you provided says:

Check if C:\Users\chawki\node_modules\babel-eslint is outside your project directory. For example, you might have accidentally installed something in your home folder.

Browse to C:\Users\chawki\node_modules\ and delete the babel-eslint folder, or simply delete C:\Users\chawki\node_modules.

I just deleted the node_modules folder (for me it was C:\user\[yourUserName]\node_modules\) and re-installed it.

Here What i did...

1. C:\user\[yourUserName]\node_modules\babel-eslint and delete the file
2. C:\user\[yourUserName]\node_modules\eslint and delete the file