关于node.js：无法运行\\’npm start \\’ReactJS

Can not run 'npm start' ReactJS

我是ReactJS nad Yeoman生成器中的新手。如此我有一个问题，因为使用此命令生成项目时

npm install -g yo

npm install -g generator-react-webpack

yo react-webpack

然后我设置项目名称，使用CSS，然后启用postcss。
当我尝试使用表扬
npm start#或npm run serve

npm运行发球

@0.0.1 serve C:\\Users\\user\\Desktop\\ProjectReact
node server.js --env=dev

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events.js:183
throw er; // Unhandled 'error' event
^

Error: listen EACCES 127.0.0.1:8000
at Object._errnoException (util.js:992:11)
at _exceptionWithHostPort (util.js:1014:20)
at Server.setupListenHandle [as _listen2] (net.js:1338:19)
at listenInCluster (net.js:1396:12)
at GetAddrInfoReqWrap.doListen [as callback] (net.js:1505:7)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:97:10)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @0.0.1 serve: `node server.js --env=dev`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @0.0.1 serve 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\\user\\AppData\
oaming\
pm-cache\\_logs\\2018-05-25T07_27_23_660Z-debug.log