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[Bolean]

In preflight Verifier:

Free Objects

      text23
              Object is not on a page              Background
              Empty Text Frame                      Background

These objects and pages does not exist!
Where can I find the way to correct this error?
           

[Nermander]

If they are not there, Scribus would not give the error message.

It is an empty text frame that is somewhere outside a page, the Outline view is probably the best way to find it and delete it.

I think you can maybe even click the error and find the object. Yes, I just tried, I created a new document, made a text frame outside the text page and when I click the error in the preflight verifier I am brought to the empty frame.

[AdmFubar]

You just need to zoom out enough to see it off the page.