Element type is invalid: expected a string (for built-in components) or a class/function

Question

import React from \'react\';
import ReactDOM from \'react-dom\';
import Map from \'./components/map/container/map\';
import App from \'./App\';
import \'./index.css\         


        

Answer 1

It can also be caused from where the entry point is.

In my case, the App.js was calling index.js (where the developer console was identifying the error, and where my RenderDom call was).

However, App.js was referencing a component, and it was within that component that I had the error (a reference to yet another component that did not exist).