vue.js運行npm.run.dev報錯

ERROR in ./node_modules/mint-ui/lib/style.css (./node_modules/css-loader!./node_modules/autoprefixer-loader!./node_modules/mint-ui/lib/style.css)
Module build failed (from ./node_modules/autoprefixer-loader/index.js):
TypeError: Cannot read property 'context' of undefined
    at Object.module.exports (C:\Users\99680\Desktop\web\cms\node_modules\autoprefixer-loader\index.js:21:53)
 @ ./node_modules/mint-ui/lib/style.css 2:14-99 21:1-42:3 22:19-104
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://localhost:9999 (webpack)/hot/dev-server.js ./src/main.js

ERROR in ./src/components/home/home.vue?vue&type=style&index=0&lang=css& (./node_modules/css-loader!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/autoprefixer-loader!./node_modules/vue-loader/lib??vue-loader-options!./src/components/home/home.vue?vue&type=style&index=0&lang=css&)
Module build failed (from ./node_modules/autoprefixer-loader/index.js):
TypeError: Cannot read property 'context' of undefined
    at Object.module.exports (C:\Users\99680\Desktop\web\cms\node_modules\autoprefixer-loader\index.js:21:53)
 @ ./src/components/home/home.vue?vue&type=style&index=0&lang=css& (./node_modules/style-loader!./node_modules/css-loader!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/autoprefixer-loader!./node_modules/vue-loader/lib??vue-loader-options!./src/components/home/home.vue?vue&type=style&index=0&lang=css&) 2:14-293 21:1-42:3 22:19-298 @ ./src/components/home/home.vue?vue&type=style&index=0&lang=css&
 @ ./src/components/home/home.vue
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://localhost:9999 (webpack)/hot/dev-server.js ./src/main.js

版本是 "webpack": "^4.16.5", "webpack-cli": "^3.1.0", "webpack-dev-server": "^3.1.5"，

main.js的配置過程是

'use strict';
import Vue from 'vue';

import vueRouter from 'vue-router';

Vue.use(vueRouter);
import Home from './components/home/home.vue';

let router = new vueRouter({
    routes: [
        {path: '/', redirect: {name: 'home'}},//重定向
        {name: 'home', path: '/home', component: Home}
    ]
});

import Mint from 'mint-ui';
import 'mint-ui/lib/style.css';
Vue.use(Mint);

import Axios from 'axios';
Vue.prototype.$ajax=Axios;

import App from './app.vue';

new Vue({
    el: '.app',
    router:router,
    render: c => c(App)
})

求解啊各位，是哪里出了問題