Tried this, doesn't work

Using latest MUI

Module not found: Can't resolve '@emotion/react'

Ok install it then..
npm i @emotion/react @emotion/styled -s

Package showing up in package-lock.json.

"node_modules/@emotion/react": {
      "version": "11.7.1",
      ........

Should be good to go..

Start up the server.. npm start

Once again..
Module not found: Can't resolve '@emotion/react'