ADA-compliant violations with widgets

Trying to make website ADA-compliant, but all widgets get this violation alert: “Ensure ARIA regions, landmarks and HTML sections are identifiable” and I haven’t been able to fix the code. The following is an example (it’s a widget in the header). Any help appreciated!

<aside class="widget widget_text" id="text-13">
   <div class="textwidget">
      <h2 class="vacancy">We have no vacancies at this time</h2>
   </div>
</aside>