Input/ouput problem

readline-sync not working.After installing it shows following error.
throw err;

Error: Cannot find module ‘readline-sync.’
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/vaio/Desktop/Learn/js/ex7.js:1:81)
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)

But module is installed in working directory.

Make sure you’re using the Terminal (PowerShell) and DO NOT run it from your IDE or text editor. That’s usually why people get this error.