npm run build!!!已经安装了vue插件

Error: Cannot find module 'vue-loader/lib/plugin'

    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)

    at Function.Module._load (internal/modules/cjs/loader.js:562:25)

    at Module.require (internal/modules/cjs/loader.js:690:17)