title: Error: Cannot find module 'commander'
body: <p>when I m running sails -v, sails lift or even installing npm I m getting this error Please help -</p>
  
  <pre><code>Error: Cannot find module 'commander'
      at Function.Module._resolveFilename (module.js:536:15)
      at Function.Module._load (module.js:466:25)
      at Module.require (module.js:579:17)
      at require (internal/module.js:11:18)
      at Object.&lt;anonymous&gt; (/usr/local/lib/node_modules/sails/bin/_commander.js:6:15)
      at Module._compile (module.js:635:30)
      at Object.Module._extensions..js (module.js:646:10)
      at Module.load (module.js:554:32)
      at tryModuleLoad (module.js:497:12)
      at Function.Module._load (module.js:489:3)
  </code></pre>