"Unable to slice" message

[Delvo]

Hmmm... I see lots of other files types to export to instead of STL, but no sign of which ones Cura will or won't like...

[Delvo]

Hmmm... I see lots of other files types to export to instead of STL, but no sign of which ones Cura will or won't like...

And now I've tried them all and still can't slice anything. Cura's list of file types it claimed to be able to open overlapped with FreeCAD's list of file types it claimed to be able to export as, so I tried all six. Cura wouldn't actually open Collanda DAE, Wavefront OBJ, or X3D. It did open AMF, gITF, and PLY, but, as soon as I clicked "Slice", all three of those gave me the same message as STL, with the same three non-explanations. So Cura doesn't approve of any of the ways I can possibly export a project from FreeCAD!