How can i bind “store” correctly?

I wrote the code using a youtube video tutorial. I also wrote the same code written in the video tutorial on my computer, but the result was not good. The problem is that I am using redux to add an api file. If I connect index.js and store as follows, it gives me an error.

Cannot convert undefined or null to object
TypeError: Cannot convert undefined or null to object
    at Function.entries (<anonymous>)
    at Object.injectEndpoints (http://localhost:3000/static/js/bundle.js:66563:36)
    at baseCreateApi (http://localhost:3000/static/js/bundle.js:66581:16)
    at ./src/reducer/emehmonApi.js (http://localhost:3000/static/js/bundle.js:7038:85)
    at options.factory (http://localhost:3000/static/js/bundle.js:189281:31)
    at __webpack_require__ (http://localhost:3000/static/js/bundle.js:188687:33)
    at fn (http://localhost:3000/static/js/bundle.js:188938:21)
    at ./src/reducer/index.js (http://localhost:3000/static/js/bundle.js:7105:69)
    at options.factory (http://localhost:3000/static/js/bundle.js:189281:31)
    at __webpack_require__ (http://localhost:3000/static/js/bundle.js:188687:33)

import React, { Suspense } from "react";
import ReactDOM from "react-dom";
import App from "./App";
import { BrowserRouter, HashRouter } from "react-router-dom";
import Spinner from "./views/Spinner/Spinner";
import "./style.scss";
import { Provider } from "react-redux";
import store from "./reducer";

ReactDOM.render(
  <BrowserRouter>
    <Suspense fallback={<Spinner />}>
      <HashRouter>
        <Provider store={store}>
          <App />
        </Provider>
      </HashRouter>
    </Suspense>
  </BrowserRouter>,
  document.getElementById("root")
);