npm run dev 执行时出现错误Module build failed: Error: emitFile is required from module system

ERROR in ./src/images/4-2.png Module build failed: Error: emitFile is required from module system at Object.module.exports (/Applications/MAMP/htdocs/GitHub-vue-project/vue2-happyfri/node_modules/file-loader/index.js:9:27) at Object.loader (/Applications/MAMP/htdocs/GitHub-vue-project/vue2-happyfri/node_modules/url-loader/dist/index.js:76:19) @ .//css-loader!.//vue-loader/lib/style-rewriter.js?id=data-v-5aa333df!.//less-loader!.//vue-loader/lib/selector.js?type=styles&index=0!./src/page/score/index.vue 6:215-246