DevTools failed to parse SourceMap: webpack:///node_modules/sockjs-client/dist/sockjs.js.map

I'm trying to setup a simple html/Js page.

I've installed webpack and babel. I've configured package.json file with the "build" and "start" scripts.

The page works pretty well but the Warning: "DevTools failed to parse SourceMap: webpack:///node_modules/sockjs-client/dist/sockjs.js.map" raises every time I execute the "npm run start" command and I can't debug my code in the Chome Devtools

package.json:

{
  "name": "my-proyect",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --config ./webpack.config.js --mode development",
    "build": "webpack --config ./webpack.config.js --mode production",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.9.0",
    "@babel/preset-env": "^7.9.0",
    "babel-loader": "^8.1.0",
    "html-webpack-plugin": "^4.0.3",
    "webpack": "^4.42.1",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.10.3"
  }
}

webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
    // 1
    entry: './src/index.js',

    /////////  BABEL ///////////////
    module: {
        rules: [
          {
            test: /\.(js)$/,
            exclude: /node_modules/,
            use: ['babel-loader']
          }
        ]
      },
      resolve: {
        extensions: ['*', '.js']
      },
    ////////////////////////
    ///////// Plugins ///////////
    plugins: [
        new HtmlWebpackPlugin({
            title: 'Hello Webpack bundled JavaScript Project',
            template: './src/index.html'
          })
    ],
    // 2
    output: {
      path: __dirname + '/dist',
      publicPath: '/',
      filename: 'bundle.js'
    },
    // 3
    devServer: {
      contentBase: './dist'
    }
  };

I will really appreciate if someone can guide me through this problem.

Regards.