title: npm WARN optional dep failed, continuing fsevents@0.3.6
body: <p>I am install browserSync <code>npm install browser-sync</code></p>
  
  <p>but have a problem <code>npm WARN optional dep failed, continuing fsevents@0.3.6</code></p>
  
  <p>What is this error and how it can be solved ? </p>
  
  <p>gulp  does not start</p>
  
  <p>P.S: It worked before . Already 2 project so created. clear cache - not help</p>