title: grunt karma getting error .... Loading "grunt-karma.js" tasks...ERROR
body: <p>Loading "grunt-karma.js" tasks...ERROR</p>
  
  <blockquote>
    <blockquote>
      <p>TypeError: Cannot read property 'prototype' of undefined
      Warning: Task "karma" not found. Use --force to continue.</p>
    </blockquote>
  </blockquote>
  
  <p>Aborted due to warnings.</p>
  
  <p>I'm experiencing this issue too.
  I'm using node 7.5.0 and npm 4.1.2.</p>