I am using Inkscape 1.3 (0e150ed, 2023-07-21) on a MacBook Pro from 2013, running macOS 10.15.7 (Catalina).

I can't get the Interpolate Between Paths extension to work. It keeps telling me that I need to select at least two paths when I have done so.

This is the image before I click Apply (or LIve Preview—both give same error):

When I try to apply it I get the following error message:

When I close the error window, I am returned to the original screen, with both paths clearly selected.

I am sure I am doing something that is pretty basically wrong, but I cannot find what it is. Does anyone know?

Thank you!

Never mind!

I just noticed they are shapes, not paths, even though they've been automatically labeled "path".

It's working again.

They are labeled 2 objects of Type Circle from what I spot at the Status Bar.

The names say "path1" and "path2". That was what I was alluding to.

If I remember correctly, in earlier versions, it would have said "circle 1" and "circle 2", and I would have converted them to paths before trying to interpolate.