npm start problem

[clv-vmware]

hi, i am new to redux, and I am trying to run your examples, when I just run 'npm start', I got the errors below, my node.js is 6.10.0 , can u help me with that ? Thanks : )

events.js:160
throw er; // Unhandled 'error' event
^

Error: listen EADDRNOTAVAIL 172.18.243.90:8000
at Object.exports._errnoException (util.js:1022:11)
at exports._exceptionWithHostPort (util.js:1045:20)
at Server._listen2 (net.js:1246:19)
at listen (net.js:1295:10)
at net.js:1405:9
at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10)