asterix-app/src/main/resources/webui/errortemplate_message.html

<div class="accordion" id="errorblock">
  <div class="accordion-group">
    <div class="accordion-heading">
      <a class="accordion-toggle" data-toggle="collapse" data-parent="#errorblock" href="#levelOne">
        Message
      </a>
    </div>
    <div id="levelOne" class="accordion-body collapse in">
      <div class="accordion-inner">
        <pre class="error">%s</pre>
      </div>
    </div>
  </div>
</div>