title: Extjs4.1, Retrieve response message after store sync
body: <p>How to retrieve response message in failure function?</p>
  
  <pre><code>store.sync({
   success : function(){},
   failure : function(response, options){
     console.log(response.responseText); //it does not work, because there is responseText attr in response
   }  
  });
  </code></pre>
  
  <p>Response Text is like this, </p>
  
  <pre><code>{"success":false,"message":"Test Error"}
  </code></pre>
  
  <p>Anybody know, please advice me.</p>
  
  <p>Thanks</p>
  
  <p>[EDIT]</p>
  
  <pre><code>console.log(response); 
  </code></pre>
  
  <p>then,</p>
  
  <p><img src="https://i.stack.imgur.com/JkK4P.jpg" alt="enter image description here"></p>