我刚刚安装了该styled-components库并开始使用它。

但是这个简单的例子：

import React from 'react'
import styled from 'styled-components'

const Div = styled.div`background: red;`

const AlertCard = () => (
  <Div>Hello World</Div>
)
export default AlertCard

和渲染功能：

render() {
  const { fetchingAlerts, alerts } = this.props

  return (
    fetchingAlerts ? 
      <Loader /> :
      <div>
        <AlertFormContainer />
        <div>
          {alerts.length === 0 ?
            <EmptyAlerts /> :
            <div>
              {alerts.map(alert => (
                <AlertCard text="My text " />
              ))}
            </div>
          }
        </div>
      </div>
    )
  )
}

触发此错误： Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

样式组件返回一个对象 $$typeof: Symbol(react.element)

我不知道出了什么问题