Error message “Uncaught TypeError: Cannot destructure property ‘basename’ of ‘React2.useContext(…)’ as it is null” [duplicate]

You’re using Link from react-router-dom, which is calling useContext. The context it is looking for is provided by BrowserRouter, but your app is not wrapped by a BrowserRouter. Your index.js:

import { BrowserRouter } from 'react-router-dom'

render(
  <BrowserRouter>
    <App />
  </BrowserRouter>,
  document.getElementById('root')
)