I can't tell, but is "Revolve 1" a surface? It's not possible to remove material from a surface with solid operations.
That's the only thing that occurs to me. If that isn't it, use the advanced editor (the nearly invisible text in the upper right corner of the Reply editor window) to add the file.
I don't have an academic copy, so I can't open it, but other users may want to, if "Revolve 1" is not a surface.