Error menu doesn't show actual errors

[Grundoon Groundhog]

How does one discover the nature of the errors when the warning symbol appears at the bottom of a document? Please see attached file; this is what I see when I do preflight, or turn the arrowhead down: nothing. If there's overrun text when I try to make a PDF it usually tells me so, and where. But apparently there are other errors.

[Eugene Tyson]

Click the arrow beside the Overset Text it's the little > beside it

That will then show you where they are and you click on the page number to bring you there.

[Derek Cross]

Double-click with the Selection Tool on the error sign to bring up the Preflight panel. Select the text box that has the error and use Edit > Edit in Story Editor to see the issue (such as overset text or additional line spaces) and correct it.