Error "target container is not a Dom Element" after using react-hot-loader? - Codes Helper

webpack.config.js

const path = require("path")
const webpack = require("webpack")
const ExtractTextWebapckPlugin = require("extract-text-webpack-plugin") //CSS
const HtmlWebpackPlugin = require("html-webpack-plugin")
module.exports = {
    entry: "./src/index.js",
    output: {
        path: path.resolve(__dirname, "dist"),//
    filename: "[name].[hash:8].bundle.js"
    },
    module: {
        rules: [{
            test: /\.js|jsx$/,
            exclude: /node_modules/,
            use:  {
                loader: "babel-loader",
                options: {
              cacheDirectory: true,
                    presets: ["react", "env", "stage-0"],
              plugins: ["react-hot-loader/babel"]
                }
            }
        },{
            test: /\.less$/,
            use: ExtractTextWebapckPlugin.extract({
          fallback: "style-loader",
          use: ["css-loader", "less-loader"]
      }),
      include: path.join(__dirname, "src"),
      exclude: /node_modules/
     }]
    },
    devServer: {
        contentBase: path.join(__dirname, "src"),
        publicPath: "/",
        compress: true, 
        port: 8880,
        inline: true,
        hot: true
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new HtmlWebpackPlugin()
    ]
}

index.js

import React from "react"
import ReactDom from "react-dom"


import { hot } from "react-hot-loader"
import App from "./App.jsx"

const Page = hot(module)(App)
console.log(document.getElementById("app"))
ReactDom.render(<Page />, document.getElementById("app"))

html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>React</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
</head>
<body>
    <div id="app"></div>
    <script src="main.5e3d29b2.bundle.js"></script>
</body>
</html>

after starting webpack-dev-server, the error is reported, and there is only one script, left on the page. The div on it is gone. Why? Ask the great god to solve the doubt