Create React App install in Mac says MODULE_NOT_FOUND - npm

Question

I was trying to install Create React App using npm install -g create-react-app . The installation runs well without problem. There was an error that popped up when I entered npm start which is similar to snapshot below. I am using macOS High Sierra version 10.13.x and npm version 13.6.4.
Even though it says "Successfully created my-app", cd my-app and then npm start running the command in console shows following lines of errors that goes like,MODULE_NOT_FOUND.
Do anyone knows that version of npm has a issue installing create react app in Mac, please help.
i.e. >
internal/modules/cjs/loader.js:628
throw e;
^
Error: No valid exports main found for '/Users/Nirmala1/React/my-app/node_modules/postcss-safe-parser/node_modules/postcss'
at resolveExportsTarget (internal/modules/cjs/loader.js:625:9)
at applyExports (internal/modules/cjs/loader.js:502:14)
at resolveExports (internal/modules/cjs/loader.js:551:12)
at Function.Module._findPath (internal/modules/cjs/loader.js:657:22)
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:960:27)
at Function.Module._load (internal/modules/cjs/loader.js:855:27)
at Module.require (internal/modules/cjs/loader.js:1033:19)
at require (internal/modules/cjs/helpers.js:72:18)
at Object.<anonymous> (/Users/Nirmala1/React/my-app/node_modules/postcss-safe-parser/lib/safe-parse.js:1:17)
at Module._compile (internal/modules/cjs/loader.js:1144:30) {
code: 'MODULE_NOT_FOUND'
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-app#0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-app#0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:

Answer 1

Fixed this problem by upgrading node.js to v14.5, i've had v13.5 and v13.6 before on my Mac.Tried to solve by removing create-react-app globally:
npm uninstall -g create-react-app
and using:
npx create-react-app myapp
But it didn't work for me. I installed latest version of node using curl -o- url command to download, like
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.37.0/install.sh | bash
and to install using nvm install version. nvm install v14.15.1
and npx create-react-app myapp
worked well by loading create react app page in http://localhost:3000/.

Answer 2

I came across the same issue with code: 'MODULE_NOT_FOUND' on Ubuntu. I was using an older version of node at the time. All I had to do was to upgrade to the latest version by using the Node Version Manager nvm
Type in the command line:
nvm install stable
That should get you the latest version and then go back to your react app and do as before npm start.