module error

[dyh3664]

Hi,
I try run devicehive-ws-proxy, i got follow error:
`
~/tmp/devicehive-ws-proxy$ sudo node ./src/proxy.js
module.js:549
throw err;
^

Error: Cannot find module 'json-evn-configurator'
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object. (/home/hao/tmp/devicehive-ws-proxy/config/index.js:2:22)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
`

OS: ubuntu 18.04
node version: v8.10.0