index.js

import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import App from './App'
import { Provider } from 'react-redux'
import store from './store'

ReactDOM.render(
  <React.StrictMode>
    <Provider store={store}>
      <App />
    </Provider>
  </React.StrictMode>,
  document.getElementById('root')
)
     

store.js

import { createStore, combineReducers } from 'redux'
import thunk from 'redux-thunk'
import { composeWithDevTools } from 'redux-devtools-extension'
import { bookReducers } from './reducers/bookReducers'

const reducer = combineReducers({
  book: bookReducers,
})

const middleware = [thunk]
const initialState = {
  books: [],
  isLoading: false,
  eror: '',
}

const store = createStore(
  reducer,
  initialState,
  composeWithDevTools(...middleware)
)

export default store

error I got in my console

I got this error from provider component while adding prop store but its the same as in redux docs . what is happening here