Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object

In my case (using Webpack) it was the difference between:

import {MyComponent} from '../components/xyz.js';

import MyComponent from '../components/xyz.js';

The second one works while the first is causing the error. Or the opposite.

you need export default or require(path).default

var About = require('./components/Home').default

Have you just modularized any of your React components? If yes, you will get this error if you forgot to specify module.exports, for example:

non-modularized previously valid component/code:

var YourReactComponent = React.createClass({
    render: function() { ...

modularized component/code with module.exports:

module.exports = React.createClass({
    render: function() { ...

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