I configured webpack.config.js, according to the vux document and reported this error. I checked again and said that it was OK to change the alias in resolve, but it still didn"t work after I finished it.

this is webpack.config.js

const path = require("path");
const htmlWebpackPlugin = require("html-webpack-plugin");
const VueLoaderPlugin = require("vue-loader/lib/plugin");
const vuxLoader = require("vux-loader")


const webpackConfig = {
  mode: "development",
  entry: "./src/index.js",
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "bundle.js",
  },
  resolve: {
    alias: {
      "vue$": "vue/dist/vue.js"
  },
    extensions: [".js", ".vue", ".json", ".less"],
  },

  plugins: [
    new htmlWebpackPlugin({ 
      template: path.join(__dirname, "./src/index.html"), 
      filename: "index.html"
    }),
    // make sure to include the plugin for the magic
    new VueLoaderPlugin()
  ],
  module: {  
    rules: [
      { test: /\.css$/, use: ["style-loader", "css-loader"] },
      { test: /\.less$/, use: ["style-loader", "css-loader", "less-loader"] },
      { test: /\.scss$/, use: ["style-loader", "css-loader", "sass-loader"] },
      { test: /\.(jpg|png|gif|bmp|jpeg)$/, use: "url-loader " },
      { test: /\.(ttf|eot|svg|woff|woff2)$/, use: "url-loader" },
      { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" },
      { test: /\.vue$/, use: "vue-loader" }
    ]
  }
};
module.exports = vuxLoader.merge(webpackConfig, {
  plugins: ["vux-ui"]
})