Learnyounode install error

Learnyounode install error
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#1

npm install -g learnyounode

module.js:471
    throw err;
    ^

Error: Cannot find module 'isarray'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/ubuntu/.nvm/versions/node/v6.11.2/lib/node_modules/npm/node_modules/readable-stream/lib/_stream_readable.js:32:15)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)