如圖所示，輸入npm run server后，打開控制臺顯示 Failed to load resource: the server responded with a status of 404 (Not Found)，是自己寫的程序有錯誤嗎？實在不知道是什么原因。求大神解答。

webpack.config.js的代碼如下：

const webpack = require('webpack');
module.exports = {
    entry:  __dirname + "/src/main.js",

    devtool: 'eval-source-map',

    devServer: {
        contentBase: "./dist",//本地服務器所加載的頁面所在的目錄
        historyApiFallback: true,//不跳轉
        inline: true//實時刷新
    },

    plugins: [
        new webpack.HotModuleReplacementPlugin()
    ],

    output: {
        path: __dirname + "/dist/js",
        filename: "bundle.js"
    },
};