Example demo is not working

[frontend-3]

I've tried to run the example demo simple but it doesn't work. It seems some dependencies are missing.

This is the error I have:

ERROR in ./index.js
Module not found: Error: Cannot resolve module 'react/lib/ReactMount' in /Users/able/projects/react-textfit/examples/simple
 @ ./index.js 1:334-365

ERROR in ./components/App.js
Module not found: Error: Cannot resolve module 'react/lib/ReactMount' in /Users/able/projects/react-textfit/examples/simple/components
 @ ./components/App.js 1:334-365