Expected a component class,got[object Object]

引用的组件首字母应该大写  小写就会造成错误  Expected a component class,got[object Object]

import React, { Component } from 'react';import {  AppRegistry,  StyleSheet,  TextInput,  TouchableOpacity,  ScrollView,  Text,  View} from 'react-native';import ScrollViewDemo from "./scrollViewDemo";import ScrollViewTop from "./scrollViewTop";export default class CQQLoginDemo extends Component {    render() {    return (    <ScrollViewTop/>    );  }}AppRegistry.registerComponent('CQQLoginDemo', () => CQQLoginDemo);