fail compile

[zjf121]

in ./src/components/tool/AStepItem.vue?vue&type=style&index=0&id=45f62939&lang=less&scoped=true

Syntax Error: TypeError: Cannot set properties of undefined (setting 'parent')

@ ./node_modules/vue-style-loader??ref--11-oneOf-1-0!./node_modules/css-loader/dist/cjs.js??ref--11-oneOf-1-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/postcss-loader/src??ref--11-oneOf-1-2!./node_modules/less-loader/dist/cjs.js??ref--11-oneOf-1-3!./node_modules/style-resources-loader/lib??ref--11-oneOf-1-4!./node_modules/cache-loader/dist/cjs.js??ref--1-0!./node_modules/vue-loader/lib??vue-loader-options!./src/components/tool/AStepItem.vue?vue&type=style&index=0&id=45f62939&lang=less&scoped=true 4:14-561 15:3-20:5 16:22-569
@ ./src/components/tool/AStepItem.vue?vue&type=style&index=0&id=45f62939&lang=less&scoped=true
@ ./src/components/tool/AStepItem.vue
@ ./node_modules/cache-loader/dist/cjs.js??ref--13-0!./node_modules/babel-loader/lib!./node_modules/cache-loader/dist/cjs.js??ref--1-0!./node_modules/vue-loader/lib??vue-loader-options!./src/pages/result/Success.vue?vue&type=script&lang=js
@ ./src/pages/result/Success.vue?vue&type=script&lang=js
@ ./src/pages/result/Success.vue
@ ./src/router/async/router.map.js
@ ./src/router/async/config.async.js
@ ./src/router/index.js
@ ./src/main.js
@ multi (webpack)-dev-server/client?http://192.168.31.99:8080&sockPath=/sockjs-node (webpack)/hot/dev-server.js babel-polyfill whatwg-fetch ./src/main.js