Module not found: Can't resolve '@material-ui/core/AppBar'

Try - yarn add @material-ui/core

This resolved the broken dependencies between materialui and react. Worked for me in my case, it was @material-ui/core/chippedInput that was missing.

The solution that worked for me is the following:

npm install  @material-ui/core

Check the link https://www.npmjs.com/package/@material-ui/core