各位大佬，最近把vue 升级到 3.0 但是之前得 2.9.6 得项目没办法启动了，求问一下，怎么在不降版本得前提下，运行之前得项目。
（我搜了好多，都是如何在vue 3.0 基础上 创建2.0 得项目）

报这个错呢

E:\lc\jinan\resource-management>npm run dev

> resource-management@1.0.0 dev E:\lc\jinan\resource-management
> webpack-dev-server --host 192.168.1.179 --inline --progress --config build/webpack.dev.conf.js

 10% building modules 1/1 modules 0 activeevents.js:174
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRNOTAVAIL: address not available 192.168.1.179:8081
    at Server.setupListenHandle [as _listen2] (net.js:1262:19)
    at listenInCluster (net.js:1327:12)
    at doListen (net.js:1460:7)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
Emitted 'error' event at:
    at emitErrorNT (net.js:1306:8)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    [... lines matching original stack trace ...]
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! resource-management@1.0.0 dev: `webpack-dev-server --host 192.168.1.179 --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the resource-management@1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\fengcy\AppData\Roaming\npm-cache\_logs\2019-11-11T08_51_46_088Z-debug.log