appledeMacBook-Pro:webpack_z apple$ npm run dev

> webpack_z@1.0.0 dev /Users/apple/Documents/myGit/webpack_z
> webpack-dev-server --config webpack.dev.js --open

events.js:174
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRNOTAVAIL: address not available 140.143.221.119:9000
    at Server.setupListenHandle [as _listen2] (net.js:1253:19)
    at listenInCluster (net.js:1318:12)
    at GetAddrInfoReqWrap.doListen [as callback] (net.js:1451:7)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:61:10)
Emitted 'error' event at:
    at emitErrorNT (net.js:1297:8)
    at process._tickCallback (internal/process/next_tick.js:63:19)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! webpack_z@1.0.0 dev: `webpack-dev-server --config webpack.dev.js --open`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the webpack_z@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! /Users/apple/.npm/_logs/2019-07-16T08_02_40_352Z-debug.log
appledeMacBook-Pro:webpack_z apple$

这个报错是怎么回事--

在生产环境，使用soucre map打包vue文件报错
Unhandled rejection Error: original.line and original.column are not numbers -- you probably meant to omit the original mapping entirely and only map the generated position. If so, pass null for the original mapping instead of an object with empty or null values.
    at SourceMapGenerator_validateMapping [as _validateMapping] (/Users/threewhisky/Desktop/miaomovie/node_modules/webpack-sources/node_modules/source-map/lib/source-map-generator.js:276:15)
    at SourceMapGenerator_addMapping [as addMapping] (/Users/threewhisky/Desktop/miaomovie/node_modules/webpack-sources/node_modules/source-map/lib/source-map-generator.js:110:12)