Checks fails to display error component!

When doing Preview or Publish within the Rapid Developer Course tutorial  in I see “Checks (9)” When I click on any of the nine checks I expect to be taken to the widget for which there is an error but instead I see a popup at top that says:                 The document “ cannot be opened as it is no longer part of the project. Publish you application again to refresh the list of consistency errors. What to do? Screenshot illustrates below in context:  
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