This is because there is no Primary Category selected or no Publish Date is entered. 
  • To change this navigate to the Page the Item displays on and click Edit on the Announcement
  • Select the Radio Button in the correct Category to be Primary, and/or Enter a Publish Date or remove a Expire Date​
  • Click Save

Or 
  • onMessage
  • Content
  • Announcment
  • Search for the Category
  • Click Edit into the Announcement Item
  • Select the Radio Button in the correct Category to be Primary, and/or Enter a Publish Date or remove a Expire Date
  • Click Save​