I am trying to create a new item on the left hand side panel in Umbraco backoffice main dashboard via Dashboard.config and applications.config. I previously successfully created a new item before but this time it does not work. I've added

Dashboard.config

  <section alias="StartupXxxDashboardSection">
    <areas>
      <area>xxx</area>
    </areas>
    <tab caption="xxx">
      <control>
        /umbraco/backoffice/xxx/abc
      </control>
    </tab>   
  </section>

applications.config

<?xml version="1.0" encoding="utf-8"?>
<applications>
  <add alias="content" name="Content" icon="traycontent" sortOrder="0" />
  <add alias="media" name="Media" icon="traymedia" sortOrder="1" />
  <add alias="settings" name="Settings" icon="traysettings" sortOrder="2" />
  <add alias="developer" name="Developer" icon="traydeveloper" sortOrder="3" />
  <add alias="users" name="Users" icon="trayuser" sortOrder="4" />
  <add alias="member" name="Members" icon="traymember" sortOrder="5" />
  <add alias="forms" name="Forms" icon="icon-umb-contour" sortOrder="6" />
  <add alias="translation" name="Translation" icon="traytranslation" sortOrder="7" />
  <add alias="xxx" name="Xxx" icon="traymedia" sortOrder="8" />
</applications>

Added the following in area alias="sections" in en.xml

<key alias="xxx">Xxx</key>

Is there anything missing that prevents the new XXX item appear on the Dashboard?