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https://www.ideateinc.com/blog/2013/...-revit-view-33
Revit gives you "error messages" that seem like they're errors, but they're really not. It's just Revit's way of notifying you of something. Problem is, most newcomers don't know what the problem is, let alone how to resolve it.
What's happening is the Section is simply hidden in the View, and Revit's telling you that, while the Section technically was created, the Section Callout symbol isn't visible, aka "hidden". The link above gives you the steps to hammer down how to make it visible. I would check the Visibility/Graphics category or filter to see if it's unchecked.
Welcome to Revit, enjoy the endeavor.
-TZ
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