对于我来说，这发生在我试图将命名导入作为默认导入时，所以我得到了这个错误

import ProductCard from '../../../components/ProductCard' // that what caused the issue

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `TopVente`.

所以我必须通过名称导入来修复它

import { ProductCard } from '../../../components/ProductCard'

对于未来的谷歌人:

我解决这个问题的方法是将react和react-dom升级到NPM上的最新版本。显然，我正在导入一个使用新片段语法的组件，它在我的旧版本的React中被打破了。

我得到了完全相同的错误，做这个代替:

npm install react-router@next 
react-router-dom@next
npm install --save history

EDIT

你把过程复杂化了。只要这样做:

index.js:

import React from 'react';
import ReactDom from 'react-dom';
import routes from './routes.js';
require('jquery');
import 'bootstrap/dist/css/bootstrap.min.css';
import 'bootstrap/dist/js/bootstrap.min.js';
import './css/main.css';

ReactDom.render(<routes />, document.getElementById('root'));

routes.js:

import React from 'react';
import { AppContainer } from 'react-hot-loader';
import { Router, Route, browserHistory, IndexRoute } from 'react-router';
import store from './store/store.js';
import { Provider } from 'react-redux';
import App from './containers/App.jsx';
import Products from './containers/shop/Products.jsx';
import Basket from './containers/shop/Basket.jsx';

const routes =
    <AppContainer>
        <Provider store={store}>
            <Router history={browserHistory}>
                <Route path="/" component={App}>
                    <IndexRoute component={Products} />
                    <Route path="/basket" component={Basket} />
                </Route>
            </Router>
        </Provider>
    </AppContainer>;

export default routes;

我丢失了一个React片段:

function Bar({ children }) {

  return (
    <div>
     {children}
    </div>
  );
}

function Foo() {
  return (
    <Bar>
      <Baz/>
      <Qux/>
    </Bar>
  );
}

上面的代码抛出上面的错误。但这就解决了问题:

<Bar>
  <>
    <Baz/>
    <Qux/>
  </>
</Bar>

这真的很简单。当我开始编写React时，我遇到了这个问题，这个问题几乎总是因为导入:

import React, { memo } from 'react';

你可以对它进行解构，因为react lib有一个memo属性，但你不能这样解构

import { user } from 'assets/images/icons/Profile.svg';

因为它不是一个对象。

希望能有所帮助!