I create one component in the widget folder and import it into my main homepage (index.js)

It showing error

Error: Element type is invalid: expected a string (for built-in components) or 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.

The main file code is

import { React, Component } from "react";
import axios from "axios";
import Style from "./widget-style/Notified.module.css";
import NotifiedModal from "../modals/NotifiedModal";

export default class GetNotified extends Component {}