title: 'Missing command error' in cordova-screenshot plugin
body: <p>I am trying to take screenshot in my cordova application. I am using <a href="https://github.com/gitawego/cordova-screenshot" rel="nofollow">https://github.com/gitawego/cordova-screenshot</a> plugin.</p>
  
  <pre><code>  navigator.screenshot.save(function(error,res){
        if(error){
          console.error(error);
        }else{
          console.log('ok',res.filePath);
        }
      },'jpg',50);
  </code></pre>
  
  <p>console.error('error') throws 'Missing Command Error'.. Any help?</p>