Reactjs UncaughtbTypeError:（0，_redux2.default）不是函数

我正在尝试使用react redux，但出现此错误

UncaughtbTypeError:（0，_redux2.default）不是函数

Index.js

import React from 'react';
import ReactDom from 'react-dom';
import Provider from 'react-redux';
import { createStore } from 'redux';
import reducer from './src/reducers/Index';
import Root from './src/views/Root';

let store = createStore(reducer)

ReactDom.render(
    <Provider store={store}>
        <Root />
    </Provider>,
    document.getElementById('content')
);

Reducer（Login.js）

---

在Reducer（Index.js）中，将import语句更改为从“redux”导入{combineReducers}，尝试从“redux”导入{combineReducers}；我也有同样的问题，我的combinereducer是来自'redux'的mport{combinereducer}；。有人有什么解决办法吗？

import combineReducers from 'redux';
import Login from './Login';

const reducer = combineReducers({
    Login
})

export default reducer

export default function login(state = [], action) {
    switch (action.type) {
        case 'LOGINLOADING':
            return false
        case 'LOGINLOADED':
            return true
        default:
            return state
    }
}