title: Uncaught Error: INVALID_STATE_ERR: DOM Exception 11
body: <p>I am getting the below error.</p>
  
  <blockquote>
    <p>Uncaught Error: INVALID_STATE_ERR: DOM Exception 11</p>
  </blockquote>
  
  <p>Here is the code where I am getting Error RUN TIME.</p>
  
  <pre><code>xhttp.setRequestHeader("Content-type","application/xhtml+xml");&lt;br&gt;
  xhttp.open("POST",xmlFile,true);&lt;br&gt;
  xhttp.send(postData);
  </code></pre>
  
  <p>I tried with <code>false</code> in the third parameter of xhttp.open.<br>
  Can anyone tell me what's causing this?</p>